Bi guys

Okay, this was inspired by B's comments.  I was curious have/would either of you date a bisexual guy?  I was curious because there does seem to be a double standard out there.  Most guys don't seem to mind if their person of interest is into girls too, but it seems like most women have a very strict thing about not dating guys who are into guys too.  Why is that?  I mean I get the straight guy and bi-girl thing (he's thinking threesome), Why not the other way?