Think about it this way: all jokes aside, for anyone who has ever had sex with a really attractive woman, you might have experienced a situation in which it was a disappointment. Yeah she's a beauty, but cavalier about sex. I don't mean cavalier in a "I'll do it with anybody" sense, but more of a "I'm beautiful. I don't have to make any effort. You should feel privileged that I let you fuck me in the first place" way. This has happened to me a few times. For great sex you want one major thing: an enthusiastic girl. Often this is a woman who loves sex but hasn't experienced it often enough as she'd like--i.e. a new divorcee--or a sexually experienced gal who knows all the ropes, like a porn star. For example: I have a major hot woodburn for Jennifer Connelly. But I just KNOW she'd be a lousy lay. Okay...I'll admit I'd like to pump my penile petrol into her magnificent mouth, but after doing that(and a few more things) I damnedit guarantee I'll look back and say: "That wasn't so great!"