Actually there are a lot of people in London in a variety of scenes.
I have friends ranging from swingers, to tarts to serious D/s relationships.
Truthfully London has everything you could possibly ever want in any kind of sexual or sensual depravity whether you be animal, vegetable or mineral and regardless of gender or sexuality.
It's kinda fun like that.
Me, I'm boring, living with a girl 11 years younger than my youthful 32 years and about 110 times better looking. Still, she's the inside section of my soul so such is life. However that's not to say we don't sometimes enjoy a good time with others and given the right conditions can be very open.
However, London scene is more than happening, it's probably one of the hottest in the world, so get out there and enjoy it wo/man!