Body shape, musculature, resembles a human male.
I don't know many human males with mandibles...
And at the end of the day, it had to have a stunt performer inside the suit, so humanoid was the only shape it could be. They'd already experimented with a more non-human shape on the original Van Damme suit and it just didn't work on location.
I know there are female bodybuilders and females that can achieve that shape, but they are the exception to the rule.
"It has to be a man because men look like that, and some women too!"
The fact remains, given that they're aliens
, none of these human comparisons you keep making mean squat. The idea that this intergalactic hunter from across the known universe would somehow align with human anatomy is pretty laughable, given that nothing else on the same planet
as us has such similar physiology.
Also, since they were designed that way, if they were intended to be female, why were they drawn to resemble human males in body shape?
Because it wasn't necessary to differentiate? Because they didn't care what sex it was? Because they realised tits would look stupid? Because Stan Winston was intelligent enough to know an alien almost certainly wouldn't have identical physiology to a human, like I just said? You'd have to ask them.
Winston himself did
say that the difference in skin coloration between the first two films was akin to snakes. Don't see many snakes with breasts.
Except the things I just mentioned.
And like I just mentioned, none of that proves anything, because using human biology as hard proof of (fictional) alien biology is completely pointless. Do female Xenomorphs have breasts? So I'm still waiting to hear some bona fide evidence that you have from the films that shows they must be male.
The fact is, the creatures seen in the movies could very easily be female, and there is sweet f.a. to prove otherwise. Just like there's sweet f.a. to prove they are. Who says the things even have