Looks like you're onto me. Besides, you asked the question, didn't you want to know the answer? I'm being truthful for once.
Faking its just another part of sex; sometimes it happens. Just like sometimes you get bored and decide to take pity on the poor sod who doesn't have a clue what he's doing or you go "ooh wow!" at his tiny todger.
There was this one time in Greece [..] Actually. Never mind.