Actually there are female predators, though at the time of the first two movies, the predators as a species hadn't been fully fleshed out, nor has it been since, just expanded upon. A general consensus at the time (from what I understand)is that there were female Yautjas, but that they were passive in comparison to their male counter parts. A few comics later and some more expansion on their mythos and it turns out that females and males both do the hunting. I think they live segregated from each other for most of their lives until mating season arrives. I think Krogans were inspired from them in that respect at least. Up until then it was generally seen as a "male" oriented sci-fi movie series. And its not hard to see, their imposing creatures with muscled physics with an affinity for blades and projectile weapons, hunting dangerous creatures for sport, honor and respect. Its very, VERY, prototypically male, just as say, my little pony is very, VERY prototypically female until the bronies came. Anywho, hope that answered some questions and feel free to fact check me, since most of this was off the top of my head from when I read some months ago.



-cheers