I am guessing that was why despite him sticking his sword into just about every sheath out there, he ended up dating Summer. Since he could actually keep a conversation with her... at least in the beginning that is.
Nah, that's a pretty unintentionally falacious take of the events in the imho, if you don't mind me saying.
For one thing, it's clear he wasn't getting nowhere near as much poontang before the countdown for Paris began - and the story tells us he was
already dating Summer for some time before that.
For another, to be fair he has been shown to be very much capable of keep conversations with each and every other lady in the game, main difference being talking - and doing - sex are also subjects on the table with them. Much less so with Summer herself, what becomes even kind of weird, considering she is supposed to be
his girlfriend.
Damn, most of the time sex scenes with her seem like reinforcement of her clinginess and done more for the sake of keeping the boyfriend than real interest, what only makes things worse, imho.