My absolute favouritest of favouritest teen-boys-think-about-sex-all-the-time book is [[Henry Tumour by Anthony McGowan]], in which poor Hector's brain tumour (Henry) is better at getting girls than he is. The teen boy's spectacular talent for cock up is just as hilarious in [[Submarine by Joe Dunthorne]] - but beware, this one is really a for adults, so it's even ruder (although I doubt this is a problem).