"When a young woman is in desperate need of money and a wealthy man comes along and uses that vulnerability to get sex, that's the definition of exploitation." Seems like you could also say: "When a man is in desperate need of sex and a young woman comes along and uses that vulnerability to get money, that's the definition of exploitation."
Lack of money is a much more severe situation than lack of sex. Lack of money comes with the possibility of poverty, while lack of sex just means that you will have to wait longer for sex.
Seems to me he's saying that the women aren't doing it to survive, they're doing it to get a college education. I would submit that the drive for sex is a much more primal urge, going back a half billion years or so, than the drive for a college education.