So, when I catch fungus in my foot is the fungus raping me because it's using me to reproduce?
Facehugger is not and never the same as rape. Not the same level of violence. If the monster attacked you in the genitals and its only way of killing was the face-hugging reproducting, maybe you could have a better point that the Alien series is
all about rape.
But nope. The main villain in the movies is the adult version of the Alien. And sometimes, the queen, who doesn't rape at all.
Aliens and
Resurrection have a much much much more prominent motherhood theme than a rape theme. Alien and Alien 3 have a rape theme and abortion theme if you could say. And don't get me started with Prometheus and Covenant.
Even Alien is mostly a regular slasher movie formula, it doesn't even explore rape as the "raped" being doesn't suffer psychological consequences and is killed in 3 minutes or so.
But even with that, all the movies have a lot more about that supposed "rape" theme.
Future Alien movies can perfectly be PG-13 rated and still have interesting and fascinating storyline without that 'rape focus' you all seem to be married with.