Like 0.1% of Fate/stay night is sex, but all you hear is mollusk-chat. Just sayin' the same applies to VNs, except its probably not 0.1% of VN's that are porn games.
Oh, yeah, in that case, you're right, although most VNs' sex scenes aren't as, uh, memorable as Fate's (though Saya no Uta's is pretty memorable as well, for all the wrong reasons).