Is this necessary?

I was at a party this weekend and some of the guys were talking about a time when one of them got into it with some guy at a club. Apparently, it was all over his girl being checked out by the guy. So, guys, do you feel it's necessary to confront guys checking out your girl? And, girls, do you want your guys to step in and say something if another guy is just looking?
Is this necessary?
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