I think it's less "evolutionary need to feel protected" and more "if you're gonna ask me to come, then you have to keep me alive or pay for the funeral arrangements."
Typical high-school policy against cray cray teens. I'm pretty sure it works for any gender mix of invitation.
I meant in a more generalized sense, not as a response to Alyssa's request for protection (which is the entire joke for this page). THAT was the evolved instinct for survival, haha!