I didn't generalized, It was a guess why some people can find the situation not so likely to happend. But world is all about probability and not certainty, and yes - every single person and situation is different, so who knows...
I don't know, maybe I'm weird, but even when wasted I couldn't had sex with guy [while not considering myself gay]. And if I'm not weird, probably this is why Amy sleeping with Liam sounds pretty unrealistic for some of us.