Perhaps you've played this game. Your boyfriend/girlfriend/spouse lets you have one free pass -- one special man or woman who is so attractive and out of reach that if circumstances allowed it, your partner would allow you to sleep with that person. Most monogamous couples feel safe with the free pass rule as it's more theoretical than practical. Sill, if your partner gave you a free pass, would you use it? On who? (Single people can use this prompt however they please.)
Alison Janney, maybe. Or Mary Louise Parker. Or Katee Sackhoff. This game is impossible!
I'm wracking my mind for a male choice, but no one is really jumping to mind. Maybe the kid that plays Jacob in the Twilight movies - but I'm not quite ready to be a Cougar just yet.