For one week a year, thousands of people gather here to ponder some of life's big questions. Can robots make us feel less lonely? Have we invented enough devices to replace walking yet? Does an internet-connected vibrator count as technology? Why is Ivanka Trump here?

Thousand of people are headed to Las Vegas for CES, formerly known as the Consumer Electronics Show, a massive marketing event where technology companies show off their newest innovations.

It's a parade of product announcements, very sharp TVs and weird gadgets, many of which will never be released. The show floor doesn't open until Tuesday, but events begin Sunday, and there are already some hints of what the biggest stories will be out of the event.

That includes newly sanctioned sex tech and facial recognition to track attendees – plus stealth marketing outside the official CES venue.

Ms Trump is also scheduled to give a keynote talk on Tuesday about the future of work, a decision proving controversial among some attendees.

Gadget and tech news: In pictures Show all 25 1 /25 Gadget and tech news: In pictures Gadget and tech news: In pictures Gun-toting humanoid robot sent into space Russia has launched a humanoid robot into space on a rocket bound for the International Space Station (ISS). The robot Fedor will spend 10 days aboard the ISS practising skills such as using tools to fix issues onboard. Russia's deputy prime minister Dmitry Rogozin has previously shared videos of Fedor handling and shooting guns at a firing range with deadly accuracy. Dmitry Rogozin/Twitter Gadget and tech news: In pictures Google turns 21 Google celebrates its 21st birthday on September 27. The The search engine was founded in September 1998 by two PhD students, Larry Page and Sergey Brin, in their dormitories at California’s Stanford University. 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The $2000 folding phone has been found to break easily with review copies being recalled after backlash PA Gadget and tech news: In pictures Charging mat non-starter Apple has cancelled its AirPower wireless charging mat, which was slated as a way to charge numerous apple products at once AFP/Getty Gadget and tech news: In pictures "Super league" India shoots down satellite India has claimed status as part of a "super league" of nations after shooting down a live satellite in a test of new missile technology EPA Gadget and tech news: In pictures 5G incoming 5G wireless internet is expected to launch in 2019, with the potential to reach speeds of 50mb/s Getty Gadget and tech news: In pictures Uber halts driverless testing after death Uber has halted testing of driverless vehicles after a woman was killed by one of their cars in Tempe, Arizona. March 19 2018 Getty Gadget and tech news: In pictures A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore Getty Gadget and tech news: In pictures A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore Getty Gadget and tech news: In pictures Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea Jung Yeon-Je/AFP/Getty Gadget and tech news: In pictures Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea Jung Yeon-Je/AFP/Getty Gadget and tech news: In pictures The giant human-like robot bears a striking resemblance to the military robots starring in the movie 'Avatar' and is claimed as a world first by its creators from a South Korean robotic company Jung Yeon-Je/AFP/Getty Gadget and tech news: In pictures Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea Jung Yeon-Je/AFP/Getty Gadget and tech news: In pictures Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi Rex Gadget and tech news: In pictures Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi and Kaptain Rock playing one string light saber guitar perform jam session Rex Gadget and tech news: In pictures A test line of a new energy suspension railway resembling the giant panda is seen in Chengdu, Sichuan Province, China Reuters Gadget and tech news: In pictures A test line of a new energy suspension railway, resembling a giant panda, is seen in Chengdu, Sichuan Province, China Reuters Gadget and tech news: In pictures A concept car by Trumpchi from GAC Group is shown at the International Automobile Exhibition in Guangzhou, China Rex Gadget and tech news: In pictures A Mirai fuel cell vehicle by Toyota is displayed at the International Automobile Exhibition in Guangzhou, China Reuters Gadget and tech news: In pictures A visitor tries a Nissan VR experience at the International Automobile Exhibition in Guangzhou, China Reuters Gadget and tech news: In pictures A man looks at an exhibit entitled 'Mimus' a giant industrial robot which has been reprogrammed to interact with humans during a photocall at the new Design Museum in South Kensington, London Getty Gadget and tech news: In pictures A new Israeli Da-Vinci unmanned aerial vehicle manufactured by Elbit Systems is displayed during the 4th International conference on Home Land Security and Cyber in the Israeli coastal city of Tel Aviv Getty

Sex toys are allowed. Cannabis is not

CES organises its thousands of exhibitors into categories like smart home, augmented reality, transportation – and the fast-growing health and wellness segment. And for the first time in its 52 years, the conference will allow sex-toy companies to exhibit on the show floor as part of that group, including a multitasking bed for sex and a number of “smart” and internet-connected vibrators.

CES changed its policy after some drama at last year's show. Sex-toy company Lora DiCarlo won a CES innovation award, but it was later taken away for being against CES policies prohibiting “immoral, obscene, indecent, profane” products.

The award was later reinstated, and Lora DiCarlo received far more press coverage than it would have for an award alone. After that, CES updated its policies to allow “sex tech” exhibitors in the health and wellness group.

Not all vices are getting an invite. Cannabis and tobacco technology, such as vaporisers, is still forbidden at the show. But if past years are any indication, crafty cannabis-adjacent companies will find a way around the rule with clever marketing and euphemisms. There are indoor-hydroponics systems and machines that blend essential oils (including, say, THC). Expect more of the same this year, including a secure, odour-concealing box called Trova for “objects that aren't for all audiences”.

Facial identification works on a consumer-friendly rebrand

When attendees register at CES this year, there will be a new option to confirm they are who they say they are: facial recognition. Certain CES check-in locations will have a camera set up that will snap a person's photo and automatically match it to the photo they used to register. It's opt-in and an example of how the conference and its exhibitors are trying to give the technology a more consumer-friendly image.

Facial-detection technology has caused a lot of controversy and concerns over privacy and bias. It's already in use at airports and by law enforcement and included in other surveillance systems. Now the same companies making those systems want it to be embraced as a fun, user-friendly technology that makes tasks easier.

The AvatarMind iPAL Robot was displayed during CES 2019 (Getty Images)

CES is organised by the CTA, an industry group that represents technology companies – many of whom would like to give facial detection a friendlier consumer image. Companies like Australian retail ad firm Mikara want to sell facial recognition to stores so they can serve targeted advertisements, while Black and Decker's Pria home-care robot uses it to identify users.

Balancing ethical uses of facial detection with the industry's desire for profit could be complicated for the show. Two previous CES award winners listed as exhibitors at this year's show – security camera company Ezviz, which is owned by Hikvision, and voice recognition company iFlytek – are no longer attending, CNET reported. The US Commerce Department added the companies to a blacklist in October over their alleged use in human rights violations by China against Muslims. The CTA said it does not comment on individual companies.

Lots of bathroom technology, for some reason

Smart-home technology, like web-connected thermostats and security cameras, has been in a hit in nearly every part of the house. One room that technology companies seem set on infiltrating this year is the bathroom.

At CES, a number of companies are planning to show toilet-related tech and other gimmicky products that even they admit will never go on sale. They might, however, draw some attention to normally overlooked faucet and toilet paper companies.

Toilets are getting sensors to help determine how much water each flush requires, voice assistants are standing by to flush your toilet, and wearables monitor your stomach and send you a smartphone notification when it's time to use the bathroom. Toilet paper maker Charmin is even showing off demos of something mysterious called a “roll bot”. And multiple companies promise to revolutionise teeth with high-tech toothbrushes.

The head of the CTA's research team, Steve Koenig, sees toilet tech as the next logical step for connected home technology.

“We're getting to the point where we're fulfilling the original promise of the smart home, which is creating intelligent living spaces that take care of us instead of the other way around,” he told The Washington Post.

One of the shows more shocking presentations - stripper robots performed at the Sapphire Gentleman's Club on the sidelines of CES 2018 (AFP via Getty Images)

Billboards: Where the real CES drama happens

Inside the Las Vegas Convention Centre, companies like Sony and Samsung still jockey for the biggest floor spaces and flashiest displays at CES. But not every tech company participates in the event itself. Apple, Facebook and Twitter have been notable holdouts in recent years.

Companies that don't participate in the event itself have found a way break through the noise, sometimes without paying a cent to the conference itself.

For the past two years, Google has gone from a minimal CES presence to plastering every available surface in the city with “Hey, Google” ads for its voice assistant, including the coveted front entrance to CES.

It is competing with Amazon's Alexa, and to a lesser degree Apple's Siri, for partners to include the assistant in their upcoming products. (Amazon CEO Jeff Bezos owns The Washington Post.)

Last year, in addition to monorail trains and billboards, it built an elaborate working ride – like Disney's It's a Small World but for Google products – in front of the convention centre. This year, there is already a giant Google structure with slides in front of the convention centre and more monorail ads.

Last year, Apple spent a fraction of the cost of actually attending the event on a single, snarky ad that generated far more attention. The giant billboard pasted on the side of a Marriott near the convention centre read, “What happens on your iPhone, stays on your iPhone”. It was widely interpreted as a dig at Google and a promotion for Apple's marketing push as the “privacy” company.

We'll find out whether Apple started a new sub-tweeting-via-outdoor-advertisements trend in a few days. The company will also have a speaker at CES for the first time in 28 years via an appearance from its senior director of privacy, Jane Horvath, on a privacy roundtable.