Ya see, Quix, this is more of the stuff which gives me trouble about the flying saucer movement. It has way too much human fears woven into it. And why would space aliens be so worried about our being sterilized? Aren't we supposed to be carrying their babies for them?
Knowing a lot about a field doesn’t mean one knows everything. You have less answers for stuff in this field than I do . . . by a huge margin.