if i was you i would go to a sauna. there are quite a few gay/bi saunas scattered about. i could name about 3 or 4 in london alone.
you dont have to talk to anyone, you are not pressured into anything and you dont have to do anything if you dont want to, you could just observe, check out some naked guys or even watch other guys playing. see if it does anything for you.
the steam room is usually where the action is, it will be dark in there and peoples hands will wonder. if you see someone you like the look of you just smile and follow them into the steam room and try and sit next to them. all you have to do to find out if they are interested is stroke their leg gently. if they move away or push your hand away then its a no go... take the hint. if they dont move away then thats an invite to let your hands wonder. if someone touches you and you rather they did not then you knock their hand away slowly and gently or get up and leave the steam room. no one gets offended, they move onto someone else they probably stand a better chance with.
if youre just wanting to touch or suck another guys cock or have another guy do the same to you to see if you like it or not then that would be the less complicated way to go about it if you ask me.
the hardest bit would be to pluck up the courage to actually go to one.
the reason im suggesting a sauna is as follows
usually cleaner than sex clubs, cinemas etc.
everyone is there for the same reason
no messing about with profiles, online time wasters, people who dont show up etc
its nice and relaxing just having a sauna, some saunas have cafes and lounge/tv rooms where you can people watch and decide who you are interested in.
if you cant accommodate meeting someone
you can be selective about who you play with. if guys find you attractive then you will get a lot of attention and the pick of the bunch. and probably have to slap a lot of hands lol
people are clean, showered etc
totally anonymous, no one knows your name, has your phone number.
ive been to a few saunas and not played just had a sauna because there wasnt anyone there i liked the look of. ive also been to a few saunas where ive had some really good fun dublin and amsterdam spring to mind. ive never kissed a guy and most dont attempt to kiss you either.
paington zoo is probably my most bazar place