In the wasp spiders, the males simply place a chastity belt on their partner while copulating: the tip of their genital breaks off during sexual contact, plugging the sexual orifice of the female, as German researchers discovered.

The male wasp spider is much smaller than the female. During sexual intercourse, he inserts his "penis" (the tip of a transformed leg filled with sperm) into the female's sexual orifice. After a few seconds, the female attacks her partner, and if he does not manage a quick escape, he will be eaten. "When the male detaches himself from the female, in more than 80 % of cases the tip of his genital breaks off," said the Bonn lecturer Dr. Gabriele Uhl. "The tip then remains in the sexual orifice like a cork, blocking it."