The only term I really know with this sex abbreviations thing is BTW, but that is By The Way, so I am guessing this is for people who have sex by the roadside isn't it?
I honestly don't know a lot of the abbreviations, but I do remember running a youth theatre a while back and some 14 year old girl came up to me and asked me what a Soapy Tit Wank was!
Funnily enough, the same group also had to write their own short plays and another 14 year old wrote something called 'I've got a lovely box' and couldn't work out why everyone else in the group was sniggering.