Greedies, says Felicity, are hungry for sensuality. "It's not about greed for a number of partners. I want the best, not the most - I'm very, very selective. It's a lust for life rather than a generalised lusting - an intelligent form of greed. I have lots of friendships and good relationships and sometimes they may become sexual. When I like people I don't care what genitals they have."
Felicity, 33, is a professional cook and masseuse. The Islington flat she shares with kittens Special Baby Doll, Squeaky Tiger and Precious Minx Bear, smells wonderfully of chicken breasts stuffed with pesto in the oven. "I really like people and I really like food. Pleasure and lusciousness and luxury are what I do."
Heterosexual sex, she says, has become "tired". "Since the advent of HIV, people have had to become much more explorative, and now sex is not just about penetration. Bisexualism is increasing among women simply because of dissatisfaction with men. The new man thing never really happened and when you want to find someone you can live with, talk to and get on with, often men don't always make the grade." Greedies, on the other hand, she says, make better partners. "Monosexuals haven't explored what their sexuality is all about. The bisexuals I know are much more discerning."
Being bisexual is also rather trendy. Roxi Lockwood, 26, an exotic dancer and techno-violinist who also appears in the programme, says, "Bisexuals do seem to be more to the fore at the moment. I'm not greedy in that I wouldn't have partners of both sexes at once: I'm a monogamous bisexual. It is a wider field of experience, though it can be a pain in the neck - your partner thinks you're looking at girls as well as boys."
Bisexuals have not, up to now, been very vocal. They tend to be mistrusted by both heterosexuals and homosexuals (who regard them as "traitors"). But it seems that there are a considerable number of this quiet minority. A 1995 report commissioned by the Health Education Authority, which concentrated solely on men, found that around 12 per cent of men are probably bisexual.
There is no similar data available for women bisexuals and in any case, as a group, bisexuals are difficult to pin down. One of the difficulties that the HEA study found was in deciding what exactly constitutes bisexual (Freud had at least five definitions). The HEA researchers settled on "men who had had sex with both males and females in the preceding five years". It is, however, a grey area. When asked, less than half of the men interviewed identified themselves as "bisexual"; some called themselves straight, others gay, while others used terms like "confused", "broadminded", "horny" and "normal".
In her book Vice Versa, published last year, Marjorie Garber, professor of English at Harvard University, made an in-depth study of bisexuality, and identifies a growing trend among American college students to define themselves as bisexual (aka "switch-hitters" or "AC-DC"). Another new book is to be published shortly by Cassell. The Bisexual Imaginary: Representation, Identity and Desire is a collection of essays edited by members of Bi Academic Intervention, a network of teachers, publishers and researchers working on the subject. Merl Storr, lecturer in sociology at the University of East London and one of the book's editors, agrees that bisexuals have become more high-profile. She believes that this is partly because of the HIV epidemic. "Bisexual men were demonised as carriers of the disease to the general population," she says. "Lots of people felt targeted and felt they had to fight back and become active. Also, lesbian and gay communities have come of age, and there is now more space for people to explore the contradictions of bisexuality." She is ambivalent about the use of the term "greedy" to describe bisexuals.
Acknowledged bisexuals include Sandra Bernhardt, REM's frontman Michael "I'm an equal opportunities lech" Stipe, Rachel Williams, the "supermodel" former presenter of The Girlie Show and the actor Alexis Arquette, while James Dean and Marlene Dietrich are two great bisexual Hollywood icons.
But while greed is all very well for the glamorous and famous, others can find they are less well catered for. "You can talk about bisexual greediness if you like, but in that case I'm practically anorexic," says David, 29, a teacher from Birmingham. "Greed is fine if you live in London and have places to go and similar people to meet. There is still a lot of prejudice about and people seem to find it even harder to come to terms with bisexuality than with homosexuality."
Kate, 33, who works in publishing, also dislikes the term "greedy". "It comes from a heterosexist position that bisexuals are promiscuous," she says. "We get that reaction from gays as well - that we want the best of both worlds and are letting the side down. Bisexuality still tends to be hidden. When I have a relationship with a woman, I seem to have to come out all over again." She adds a belief that many bisexuals share: "Everyone has the potential to explore their sexuality in terms of the same sex - it's a shame more people don't feel they can."
Freud's theory, too, was that everyone is positioned on a sliding scale between heterosexuality and homosexuality. Greedy or not, perhaps there are a lot more like Brett Anderson of Suede, who said, "I'm a bisexual man who has never had a homosexual experience."
`Greed', Channel 4, Monday, 10.55pm.Reuse content