Death by poisoned sperm! In the Findlays' "Flesh Trilogy", Richard Jennings, the crazed killer, injects himself with a poison that somehow not only doesn't kill him, but can also be safely stored in his knackers with no ill effect until "released". Now, I'm no scientist but from what happens next in the film, I'd take an educated guess that saliva triggers the poison to turn lethal upon contact.
