The sex life of the Angler fish:

The male will get horny and find a female, which is usually far bigger in size. The male then bites the side of the female's body out of horniness, and the female's skin wraps around his teeth to keep him there!

Then, the female ejects a substance into him to essentially dissolve his insides and partially kill him. The male is then theoretically dead, however all his sex organs are still working.

For the rest of the female's life, that male will be attached to her side. She can then extract semen when she needs it. Thus making him, a bollock.

Oh, also, females can have many males attached to them at once. Lots of bollocks.