There's no question humans find sex enjoyable. Some studies in rodents suggest that this might be similar in other mammals, but what about the rest of the animal kingdom?

New research shows that for male fruit flies, the process of ejaculation might actually be quite pleasurable.

The work implies that sexual pleasure can occur in "simple animals, not as it's been assumed only in mammals," says study leader Galit Shohat-Ophir, a neuroscientist at Bar-Ilan University in Israel. (Read why female dragonflies go to extreme lengths to avoid mating.)

Shohat-Ophir's previous research found that male fruit flies seem to find something about mating rewarding.

But it wasn't clear which part they seemed to be getting a kick out of: