A man who consistently dates woman likely to die childless in order to avoid dating a woman fit for motherhood, and the responsibility therein.
John could get any girl he wants; but, over the last three years, John has dated different mentally unstable woman at a rate of one per year. John, would never wed or impregnate these woman on a clear mind. The reason John dates these woman is because it allows him to avoid the responsibility of dating a woman of high caliber. He takes pussy from girls destined for the grave, thus John is a Grave Robber.