GeekBabe: I wonder if all the guys answering "yes" would be so hot for the idea if their wife/gf decided that turnabout was fair play and wanted a threesome with 2 guys?
Sadly (?), no. We are all quite aware that our culture has an embedded double standard that will probably never really go away.
Most porn, even the softcore variety aimed at the female audience, has much more woman to woman intimacy than anything involving two men. We are all brought up and I am sure most of us still think this way.
If you had a poll of all the heterosexuals out there, and could be guaranteed of the truth, I am pretty sure that you would find that men like watching women, and women like watching men, and many(not all) women like (or at least don't mind) looking at women, but men and many women don't really care to look at two men.
My 2 cents. And I am certainly guilty of the same opinions.