Spermula

"Spermula" is about a race of bodiless aliens living on the doomed planet of Spermula, and their attempts to eradicate the human race so that they can have their planet. The Spermulites take the form of women whose mission is to suck all the sperm out of the human males, thereby dooming the species; despite admonishments that they do not enjoy their sexual acts with the human males, all of them eventually begin to succumb to the temptations of the flesh. The famous Udo Kier plays a Spermulite who has been accidentally made a male (with an inconsiderable member), and who refuses to ask the "Great Mother" that he be made a female: he wants to be male and marry a woman. This unique and bizarrely stylized satire of conventional sexual morality somehow never became a cult hit - and very undeservedly too, as it is filled with some of the funniest dialogue this side of "Andy Warhol's Bad". As I understand it, the French filmmakers dubbed this into English themselves for their own aesthetic purposes, but I'm not entirely sure of this. It is now very obscure, but well worth the effort it takes to ferret out a copy - and hopefully some day it's worth will be more widely recognized and appreciated.