Lady squids are weird.
It seems that they coat their eggs in a rage-inducing chemical agent that turns male squid into D&D-style Berserker Dire Squids.
(There are totally going to be Berserker Dire Squids in my next D&D game.)
Hilariously, the Christian Science Monitor article about the same thing suggests that human semen could have similar effects. If true, your local pornographic film set just became much more dangerous.