It simply baffles me.

Whenever I go out to places, I commonly see men that don't have a single obvious selling point with beautiful girlfriend or generally better looking girlfriend. And by watching their relationship dynamic, it makes me even more baffled, how and why are they together?

Yes, usually, couples are looksmatched, but it isn't so rare to see guys with girlfriends that are better looking than themselves where the guy has nothing to stand out from the crowd, like literally nothing.

Those guys aren't tall, have a relatively normal physique, maybe a bit overweight, loosing hair, are a 5 in the face on a good day, no fashion sense, no positive/confident body language, uninteresting facial expressions, no charisma, no strong sense of humour, no visible jawline, no interesting hobbies, no amazing physical capabilities, no "style", make average money at best, no obvious masculine demeanor, aren't fun to be around (definitely not "life of the party"), no amazing car, no real life prospects...why are still some good looking girls with such guys?

Why does this occur?

(I'm from Europe btw)