Guys may be willing to buy her things, even lend some cash, but financing her medical plan is not on the agenda.
Screwing them is the only item on their agenda... which, apparently, is all the girls really want.
More often than not a boyfriend is a spontaneous d-ck she met at a party or at dorm whom she will be screwing for the next few weeks or months. That's the vast majority of 'boyfriends' and 'girlfriends'.
I think you, um, nailed it.