It does not always have to be bad. I am straight but if I am in a position where the guy in a couple is bi and he enjoys touching or even sucking me for the matter it would not bother me I might even like it! Its not like I have to kiss the guy. Lol

As a guy I wont mind my dick next to another guys dick in the same pleasure hole at all. But I can think that there would be some guys with a issue.