I write a lot of gay sex stories and, as they're 'wank' material for adult websites I keep all my characters over the age of 18. One of my novels concerns a 16 year old guy coming out and I can think of loads of 'coming out' and other gay novels that describe a boy's first sexual experience - usually teenage - but these novels are art, Edmund White etc. and not writen for the sexual gratification of the reader. I think that's the difference.
Oh - and there's a line in Romeo & Juliet : 'let us go to bed and let our mouths do what our hands would otherwise' (paraphrased, don't have my copy to hand) - so my guess is that some kind of oral bonking went on!
Luke