And the arcturan thing referred to colonists from a planet called Arcturus, not alien women.
When talking about the "poomtang" one marine does say to another "The one that you had was a male."
That was either 1) a joke or 2) That particular marine was an idiot. The Producers told Ridley that there aren't other aliens in that Universe aside from the Xenos.
That line must have been a holdover from before Cameron redid the script (originally Aliens was it's own separate movie with nothing to do with Aliens) and he missed it.