In the first film we are shown how Alien can be injected into human body through human mouth. In Prometheus we can see another way an Alien can be injected into its host.
More specifically, we are shown an Alien can be injected during sexual intercourse.
Are there any limitations for the way they can get to human body?
Since there is a Facehugger, perhaps there should be an Asshugger, which attaches to human ass and injects the embryo through Asshole.
I think this should be a base of scenario for the Prometheus sequel. It will be the most horrifying and scary movie of all time))). Just a joke...
