I dont believe all the stories of aliens coming to earth and abducting humans for experiments because they can't have babies. It just sounds so stupid. You mean to tell me an alien race has the technology to fly billions of miles, yet they are still too stupid to know how to make babies? C'mon.
Another reason I find alien visitation hard to believe is how did they find us? Out of the trillions of stars and planets out there, they just happened upon our planet and got lucky?
If there are aliens I think they are living on their planet wondering if other life exists or they are flying around in their ships still searching for life, but havent found us yet.