Worst. Sext. Ever.

The NYPD is on a mission to shame the creeps who browse through sleezy prostitution websites — by planting fake ads and sending warning texts to those looking to get their rocks off, The Post has learned.

“The NYPD sent you this message because you responded to an online ad for prostitution. Offering to pay or paying someone for sexual conduct is a crime and punishable by incarceration up to 7 years,” the messages read.

“Advertisements are posted by the NYPD and you won’t know which ads are from us. People who show up in response to our ads are likely to get arrested,” they continue.

Police have posted phony listings on sites like Backpage.com for years, but always waited until the would-be john showed up and then arrested him.

But while a single ad typically leads up to a dozen men to actually show up in person, another 25 to 75 guys call but either don’t book a “date” or never arrive, sources say.

The ones who don’t seal the deal get the warnings, which the NYPD’s human trafficking team began sending out in February.

They are designed to scare them away from soliciting any more sex workers.

Serial buyers are likely lost causes, but those with a lot to lose might think twice about the prospect of calling their boss or wife to say they were just busted trying to book a hooker, sources say.

“There’s nothing you can do about the regulars who do this all the time,” a source told The Post.

“But hopefully it will scare people trying it for the first time, or legitimate people who have jobs or families who don’t want to get arrested.”

The stings take place one to two times a week, across all five boroughs, sources say.

The ads are designed to be as realistic as possible — with prices matched to the going rate, generally between $100 and $300 — and are posted once police are set up in a hotel room.

Female officers answer the calls — although they’re not the women pictured in the ads — and pose as prostitutes, trying to entice the men who phone to show up in person, according to sources.

Those who show up expecting to get lucky are arrested, and those who don’t later receive the warning that they got really lucky.

The initiative is part of the NYPD’s larger effort to bust more johns and pimps, and fewer prostitutes, who are often victims themselves, sources said.

“A lot of these girls are being forced or coerced to work as prostitutes — it is human trafficking,” a source said.

Additional reporting by Ruth Brown