A sea slug’s two sexes in one;
Screw and get screwed’s how it’s done.
And with buns in the oven,
They’re game for more lovin’!
I guess getting screwed is just fun.
Lange R, Gerlach T, Beninde J, Werminghausen J, Reichel V, et al. (2012) Female Fitness Optimum at Intermediate Mating Rates under Traumatic Mating. PLoS ONE 7(8): e43234. doi:10.1371/journal.pone.0043234
(note: “getting screwed is just fun” was not the conclusion this article came to, I just like it better than theirs.)