When is the last time you heard of a Half-Human Hybrid who was human on his or her father's side? As stated under Dhampyr, these creatures' mothers tend to be human, and their fathers... something else. In the case of Vampires and Little People, a human just seems more likely to successfully carry a hybrid to term. It's also perhaps the natural outreach of Mars Needs Women. If everyone finds human chicks attractive, it stands to reason that human chicks would have more mixed kids. On the rare occasion that Venus Needs Men, the Venusians will almost always be sexy, scantily clad and conforming to Western norms of beauty, in an outgrowth of the Male Gaze. Or maybe the idea of an innocent human lady being seduced and ravished by some dashingly handsome male vampire/werewolf/demon/angel/alien/