Apologies for the thread necromancy, but I felt the want to reply because I honestly can't believe that there are people who think the Xenomorph didn't inflict sexual violence on Lambert. The alien totally raped Lambert. Scott has gone on record many times as saying that the film is an allegory for sexual violence and bodily invasion. The facehugger itself rapes Kane.
I don't know why people seem to want to find a disconnect between a director with a mission statement of conveying sexual violence through the film's imagery, and what is quite obviously intended to be a sexually violent death for Lambert. I mean for God's sake, let's just look at the editing. The tail slithers up between her (Brett's) legs before she suddenly convulses, and then we hear very long and drawn out shudders/shrieks, as if she is struggling to breath through considerable exertion. They're the sorts of sounds a woman makes when she's pushing a baby out of her womb.
I think the implication is pretty clear that the alien is forcing its tail up her vagina. I'm not saying Scott had the idea right from the offset. We all know that isn't true. But I think it's obvious that he saw an opportunity to add an extra dimension of sexual horror to her death scene, through the insertion of the footage of the tail slithering up between Brett's legs. And then of course, when we cut back to the scene of all the carnage, Lambert's pants have been torn off and there's blood pretty clearly running down the length of her legs.