I dated a nympho for awhile, were still technically friends, I had nothing against her sexuality, my problem was her blatant disregard for safety, I warned her that she should be diligent about protection, but eventually she got knocked up (not by me, mind you, I always played it safe
) I believe many women also get an instinctively desire for children, which is way they may not use protection or actively try to get impregnated.
I also believe the production of the male birth control pill will be a god send for men who fear women getting knocked up and trapping them into martial and financial responsibility, that and the great joy of says "Oh so your pregnant, well I guess you been cheating on me because its not mine, how that you say, well because I'VE BEEN ON THE PILL! HAHAHAHAHAHAHA, oooh don't believe me well lets do a genetics test on the fetus shalt we... oh don't cry so I caught you lieing, no big deal, now get out of my house, bitch!"