I thought you used it with a specific logic behind it.
The Head of an Alien resembles a male reproduction organ.
The Face of a Predator resembles a female reproduction organ.
Ranma turns from Man to Woman by getting water poured on him.
The best thing is that I hate Ranma 1/2 with all myself, yet I know this detail.
Also,
Probably my favourite Alien Poster, right after the classic "Egg" one.
Chill inducing.