I know plenty of asshole guys who look nothing like they could protect shit let alone a girlfriend and then I know tons of really nice guys who have biceps the size of mountains
Or as my sister just told me "Asshole guys are confident and cocky, and to a girl that's sexy". I think that wraps up that.
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It's not really primal at all, dating the asshole. Either their mom dated a zillion assholes and they think that's what they're SUPPOSED to do, or they think they can "change" the asshole. Also, girls who date assholes often cheat on said asshole.