It is estimated up to 80,000 men and women are involved in prostitution in the UK. Some male prostitutes work for female clients but most are paid for having sex with other men. For the most part, male prostitution takes place indoors, not on the street and much of the business results from advertising on the internet.
More than one third of the men selling sex in Britain are from overseas. Dean grew up in Greece and like many gay men, he came to London to explore his sexuality.
He worries his profession will stop people falling in love with him and is afraid to talk about it.
"I think deep down I still find it difficult to be honest with them. Maybe because there's sort of an underlying guilt in me of what I'm doing, or like, can I say a little bit of shame that I don't want to share with everyone else. It's just my own little feeling that I'm hiding somewhere."
Blue used to be a male stripper but now has a respectable job in health insurance. He sells sex at the weekend to earn some extra cash.
STREETS OF VICE
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Tuesday 29 March 2005, 2305BST, BBC One
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He returned to the sex industry a year or so after separating from the mother of his two children. He doesn't see much of them.
The women Blue works for are often married, typically in their 30s or early 40s and well-off. They find his contact details on the internet.
His work often involves staying in, waiting for the phone to ring, with his dog, Scoobie for company. Some evenings the phone rings. Sometimes it doesn't.
Ex-magistrate, Barnaby Miln is a former public school boy as are most of his clients. They come to him for role-playing and corporal punishment, often in his "headmaster's study". He sees between 20 and 30 clients a week and most sessions end with sex.
Streets of Vice: Men for Hire was repeated on Tuesday, 5 April, 2005 at 2305 GMT on BBC One.