It would be great if men and women can trust each other more. (If) I had a girlfriend, I would want her to understand that I may be looking at another girl, but I am not in a relationship with THEM. If I wanted the other girl, I would have asked THEM out, not my (hypothetical) girlfriend.
I, myself, wouldn't mind if my (non-existant) girlfriend looked at buff men, because I know that either:
1. They will already have a girlfriend
2. They're gay (You know, a bunch of MEN working out together, then showering together, then showing their muscles off to each other?)
3. They have small pensises (Making up for something, hmm?)
BB: The fear of clowns is called Coulrophobia.