lotsofplants

Actually seen this theory in at least one other place (I think a magazine article). I think it holds a lot of truth, although I tend to restate it a bit. I will not be coherent right now as it is way too late. But, basically, our culture has a zero-sum game attitude about sex--and that is about taking something from another, or doing something to another, for your own gratification. At the extreme level, this is manifested as rape. At the "socially acceptable" level it is the ideal that a guy gets a woman to "give it up" in exchange for the least hassle and commitment. It is about 'screwing-over' someone else. (The is a reason those various verbs for the act have that meaning.) And so, yes, men feel uncomfortable thinking about other men seeing them as targets for this kind of behavior. (Men also expect and treat other men as physical threats, whereas women are not supposed to be physically threatening.)