The story is based around "spermulites", the alien inhabitants of a dying planet. The only way they can save their planet is by sucking the men of planet earth dry of sperm, kind of like horny vampires.
Spermula
Werner
Tristan
Cascade
Gromana
Blanche
Grop
Ruth
Gilda
Diamant
Bonne
Sala
Liberte
Sylvie (as Sylvie Meyer)
Diana
Cardinal
Pierre
Choupetit
Luc
Petit Curé
Roxiane
Dominique
La Vieille Dane
Rita
Joan
Caline
Celine
Annette
Marie-Jo
Natacha (as Natacha Knudsen)
Francis
Little girl (uncredited)