So, I've been messing around a bit with the Aliens in Get to Work, and this is what I've learned.
One of my household sims made a satellite in the Scientist Track and Contacted aliens, shortly after two sims were abducted a Young Adult Female, and an Elder Male close to the end of his life. The Elder Male got pregnant with an Alien, preventing him from dying. When he gave birth I noticed two unusual options.
1) Send To Homeworld
2) Breastfeed
The second was only unusual because he is a Male.
Oh and about an hour after giving birth he died of old age.