Evolutionary psychologists propose that due to differences in men are more interested in short-term mating than are women.

Evolutionary psychologists propose that due to differences in  PARENTAL INVESTMENT men are more interested in short-term mating than are women.
Parental investment is the total effort that an organism give in order to create an offspring. Evolutionary psychologist argue that, since males involvment in pregnancy is only during the ejaculation (compared to female who has to carry it on their stomach for 9.5 months), males are designed to breed as many as possible