They study isn't done by comparing dikks sir. It's done by women being honest about the pleasure they are actually getting out of their sexual encounters with ya'll. And most women don't achieve an orgasm during sex so yes the dikks are trash.
She wants to NOT have sex with the good guy because she wants her to see her as more than a sex object.
The broke dudes she doesn't want and probably won't get any pleasure out of...which she knows. She's doing it out of boredom or the desire to feel validated.
One night stands have to be the most pointless thing a woman can do. You can literally get off faster by yourself. They want the company or to feel desired.
But in many cases they’re hooking up with the broke dude multiple times in a lowkey FWBs arrangement, so it’s not a one time thing. And also the broke dude spends more time hooking up with women so he’s more likely better at pleasuring women than the average dude trying to succeed in other areas of life.