Men who don't want to see their woman elope with others of the same s*x are not "brainwashed." Everyone has their own views and beliefs. It has nothing to do with "fragile egos." Monogamous men view this as cheating regardless of the gender their significant other sleeps with. We often project our beliefs into the stories we read, often putting ourselves in different scenarios within the confines of the story to see how we would react. I get my sense of conquest from having one woman I can love and die with for the rest of my life. I expect this sentiment from my partner as well. We aren't "brainwashed." If we don't condone this type of behavior in real life, most of us wouldn't condone it in fiction as well.
(If you meant this in a fictional perspective, ignore this and move about your day. I'm just venting.)
(I wish I could be this passionate in my English class. It's just soooooo boring.)
