Sex with an “alien”? Then it’s not alien, it’s human. The entire premise that we are dealing with aliens is an unfounded assumption. They are overwhelmingly humanoid in experiencers’ telling. And some experiencers talk about sex, having sperm, and even fetuses taken. The biological definition of ”species” is that voluntary sex occur only within the population. These beings if they are so interested in our sex maybe are not alien then, are they? They are human.