I would thought the whole legal thing was quite self explanatory. Even having never engaged in such before, I already know the potential legal implications. I typically just do whatever the people I am rping with want; Once you've roleplayed such lovely torture scenes as I there's really not much you can reasonably take exception to anymore xD 

As an aside, it is amusing to see people flip out over sex; the legal system, at least here in Britain, is very, very crappy when it comes to the age for... Actually just about anything. Sex and marriage before you can buy alcohol is probably the most hilarious though. Cause that makes sense xD