If you were out and about on a Friday, a couple of weeks ago, you may have noticed the streets were more crowded than usual. September 23 was Bisexual Visibility Day – the one day a year, so my bi friends claim, that they can throw off their invisibility cloaks and reveal themselves in all their multi-gender-loving glory.

It couldn't have come at a more appropriate time as, this week, we're told that there are more bisexual people in the UK than ever before.

New estimates suggest that the number of people defining themselves as bisexual has jumped by 45 per cent in just three years. For the first time, more young people in Britain describe themselves as bisexual than gay or lesbian combined, the figures from the Office for National Statistics show.

While this is undoubtedly a sign of increased tolerance - not to mention a shift in attitudes towards sexuality not being a black-or-white issue - for some sections of the LGBT community it's a source of anxiety, as they find themselves in the minority once again.

You see, biphobia is the gay community’s dirty little secret - and it arises, as discrimination so often does, from fear.

When you’re constantly told by society, or parents, that your sexuality is a phase - that your desires are deviant, or don’t even really exist - then seeing people merrily crossing between a queer existence, still littered with intolerance, and the 'promised land' of heterosexuality feels like a threat.