It becomes a problem when you date someone who kinda has trust issues and you have to convince them your best friend since college (who is another gay male) is more like a brother than anyone you could even consider being sexual with, much less cheating with.
And then you realize that, for most part, this isn't as common a problem in the straight community, as most people's BFFs tend to be of the same sex, and thus not a big deal because they're attracted to the opposite sex.
The relationship dynamics are very different in gay relationships for sure. I remember my straight friends were discussing about how they sometimes looked at girls on the street and sometimes their girlfriends would get upset, and then they asked me how would I feel if my boyfriend looked at someone, or if I felt restricted about looking at someone. When I answered " well, you guys realize we both would turn around to look, right?" they let go a big "oooohhh", heh it was amusing.