My kid came home today and informed me he'd learned the word 'boinking' at school, asking if it really was a word people used in place of sex. I nearly choked on my coffee, but I explained that it is. The conversation got me to thinking about all the different names we use for sex and how many of them are actually unpleasant, given that sex is very pleasant.
My own favourite one to hate is 'making the beast with two backs'. I don't mind reading a bit of Shakespeare but I die every time I come across this and people I know do use it (possibly to piss me off but they do say it).
I agree with the 'beast of 2 backs' - sounds hideous! And I'm probably in the minority here, 'making love' makes me want to vomit. It actually pains me to type it!
I hate the phrase "doing the naughty" because it implies that you're doing something bad or corrupt, it's stupid and gives people totally the wrong impression. It's a bad saying :(
A friend of mine uses the term 'bouncy cuddles'. I thought he was messing about , but he turns out he uses the term quite casually...
Lol, that proper sounds like what you'd say to your child who walks in... "urm, mummy and daddy what are you doing?" "Oh!, er... um... nothing sweety just some bouncy cuddles. Go put your cartoons on and we'll come and get your breakfast in a min." 
Anyway, as to the topic; you know, I actually can't think of any. I'm sure they'll be loads out there that I'd probably not be too keen on, but they'll be ones outside my own culture that I've never been exposed to, I'll bet. I quite like the variety and that there are terms out there for all different kinds and moods of... sexual intercourse (went classic ).
Over on some parenting forums I've been on in the past, people who are trying to conceive refer to it as BD - the baby dance  BLEURGH.
I agree with all those who don't like to say shag or bang. Another one which I hate (and which earned the twat who said it to me a dead arm) is 'come to bed and I'll put your hip out'. I wasn't all that impressed.