Well of course, but I would venture to guess that the aliens would have to be female. They could stumble upon a computer geek who accidentally hacked into computers used by the aliens for their planning of the takeover of the world. When his mommy runs in, they could force her to have sex with her son as a way of saving him, or they could reprogram both of them on the alien ship afterwords and force them to mate.

You know, the movie "Taboo" is legal here in the United States, and I only have to drive a few blocks to my local video rental store and I can go the back section and rent or buy it. So this scenario would hopefully not be something that you would get in trouble for.
just a thought.