So they're saying. . .infertile women may have more sexual problems

http://www.reuters.com/article/idUSTRE62N4YR20100324

OK, so if they're having these sexual problems after infertility treatment, we can possibly blame the treatments for affecting their desire and arousal. If they're having them outside of treatments, but are aware of their infertility, we could assume it's psychological. . . if they're infertile and they're NOT aware of this fact, then perhaps it's an evolutionary thing and the body's way of telling the person that there's a problem with this mechanism.