I wanna meld with Jolene Blaylock. It involves my head, but not the one I think with.
The motives of aliens are not going to be the same as humans. They're alien! Duh. But some might coincide. An example is the Pierson Puppeteers of Larry Nivens known space series. They are herd animals, cowards, but they breed, they desire to pro-create. They are protective of their "little mother" much like we are with women. Their "little mothers" are a totally separate unintelligent species. Two puppeteers agree to procreate, and they pick out a member of the second species whom they deposit their genetic packages in. The 2 packets join, form a zygote that eats it's way out of the "mother", killing it.