Assvolution!

those arms get me everytime

Well that was sly

Bravo lol

Yes, but... I think it more likely that he would have gotten smacked maybe 1/3 of the way through his explanation.

science gets you laid!

LIKE........A........BOSS!!!!!!

Barney stinson?

I disagree with having it "being an evolutionary instinct" as an acceptable response
nature prompts a lot of responses that are not acceptable in our society. When someone messes with you why don't you immediately go and fight them as your instincts dictate? Because humans have something other than just animal instinct: self control
And you can damn sure use your self control not to blatantly stare at girls' asses
You can feel the urge, but you sure as hell don't have to follow up on it.

theres one exactly like this but with boobs.

The last panel look at his left arm -_-