Most likely no. And it depends how gay I'll have to act. If you ever watched the show Spartacus, the gay scenes were like really gay. You could even see them fornicating and such and of course the top was always the gladiator while the bottom was usually some smaller sized guy. So if I was acting in a show like that, not only was I going to be put in a gay scene which I already have a problem with, I would have had to bend over naked in front of some other naked muscular dude... effing hell no!! Shit would get even more juicy if one or both of my parents happened to know about me in the show, I would be treated like Joan of Arc and get burned on a stake a total of 3 times... LOL.
I mean, it depends on the part Were I actually be an actor, I'd probably be a lot more open to it, considering I'd probably be homeless. I think yes, but I wouldn't really be comfortable kissing another dude, even in an acting role, so if the role didn't require that, then sure.