Why does the alien chick from "Species" kill the men after fricking them ? Like what the frick was she thinking

If she left them alive she'd draw much less attention. Also even if she didn't want to reproduce with them, they'd still probably help her with important alien shit as long as she strung them along a bit. If she didn't kill them it would also make it much easier for me to jerk off to the movie. What a dumb b-word

!kino