i like the progression of codewords/slang..
a gf (when i was 14) used to cough when referring to condoms...

which then became cough-medicine

which sounded like Cuthbertson, who was a teacher at the school... who's first name was george

so condoms became "George(s)"
( hubare XBOX Gamer tag: hubare | http://twitter.com/hubare, Wed 31 Oct 2007, 11:10, archived)

if you want to think of you teacher George Cuthbertson
everytime you are about to do it, go ahead.
whatever works for you.
( RedStar managed to get Star Wars onto a FP, Wed 31 Oct 2007, 11:15, archived)

funnily enough...
we used to refer to sex as "scrabble" because of something he said in a lesson when reading

"An Inspector Calls"

some like "It's not like he'd go round to see her all night to play Scrabble!!"

oh dear!!! :(
( hubare XBOX Gamer tag: hubare | http://twitter.com/hubare, Wed 31 Oct 2007, 11:18, archived)

You can get into all sorts of extended metaphors with that
such as someone getting their Scrabble board out, playing a triple word score, low scoring due to lack of consonants, etc
( divy, Wed 31 Oct 2007, 16:13, archived)

Haha...
I love it. Sex became known as 'Mr Whippy' for awhile, through some convoluted ice-cream metaphor.
(the nightmare of cake, Thu 1 Nov 2007, 14:42, archived)