Never met a girl with a sex drive even remotely close to mine. I think that would go for a lot of people here though - why else would you choose to make a living in the porn business? (money can be made elsewhere just as easily)
And Yo Adrian: that happened to me earlier this week. On a party, some incredibly hot chick was hitting on both me and my girl. My girl didn't want to try a threesome though
(and, since my girlfriend reads GFY: you're way hotter than her dear, and I don't mind at all. Like I said, she'd have been like a sandwich, while you are like an all-you-can-eat pizza buffet with unlimited cherry coke refills)