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Transgender teens Claire, Devon, Arin and Katie have set out to expose the harsh reality of modern, teen relationships.

Appearing in a new BBC Three documentary, Young, Trans and Looking for Love, they let viewers see a glimpse of their lives as they struggle to find love.

The doc shows the moment Claire, from Virginia, meets a guy that she likes, only to be rejected by him as soon as he finds out she was born a boy.

(Image: BBC)

(Image: BBC)

In the video above, Claire takes to the beach in a bikini for the first time - having avoided the moment (and a bikini) since she transitioned to female nearly a year ago.

With the help of her friends, she builds up courage to speak to boys, saying: "I'm excited as there are a lot of cute guys out there."

(Image: BBC)

"What kind of guys are you into?" the beach boys ask, as Claire replies about her ideal type, revealing "I like the guys who are really funny."

As the bikini-wearers find out the intentions of the boys, asking of they're "cute", the keen boys instantly reply with comments like "most definitely" and "gorgeous".

One boy even asks: "We should hook up sometimes."

Another says: "So I should put you in here [his phone] as 'beautiful'?"

(Image: BBC)

The boys, who were originally attracted to Claire, did not call after finding out that she is trans.

"That's it, silence," says Claire. "Like nothing from them again."

(Image: BBC)

Claire has also begun making social media diaries of her transition, sharing her experiences with transgender teens across the world.

Hoping on finding a boyfriend, she reveals that she doesn't like telling people the truth and is desperate for an operation.

She says: "In a lot of ways, I don't like telling a guy. Once I tell him all respect goes out of the window.

"Straight guys just can't get over you having the male parts.

"Once I've had or get the surgery, I think it will change a lot for me because right now if I meet a straight guy and he doesn't know - we can't get physical if I don't tell him.

"And then if he finds out, things just get so complicated, I can't even begin to explain."

It's not all doom and gloom as the programme reveals some success stories.

Arin Andrews has found love with Katie Hill and both look like they're the perfect teenage American couple in love.

They hang out together, see friends and go to the movies, but their love is one in a million - Arin was born a girl and Katie was born a boy. They are both transgender.

(Image: BBC)

Arin began life as Emerald, a beauty pageant-winning little girl. The name on Katie's birth certificate was Luke, a boy obsessed with computer games. They met as they were transitioning genders and fell head over heels in love.

They've shared their love story online - posting videos charting their relationship, the physical changes they experience and the emotional rollercoaster of what it is to be transgender, from the lows of bullying, abuse and suicide attempts to their joy as they undergo hormone treatments and surgery.

(Image: BBC)

Arin and Katie's story has inspired millions who have watched their videos online - they have become the poster boy and poster girl of the young trans community.

Meanwhile, Devon, an 18-year-old who has gone from girl to boy, looks up to Arin and takes comfort from knowing there's someone online going through the same challenges as him.

* Young, Trans and Looking for Love airs on Monday 23 November at 9pm on BBC Three