Not just pleasure!

The dissecation of sexual parts can help scientists to understand further certain behaviors. But going from within and perceiving from the standpoint of the subtle body, then this is not surprising in the least.

Actually the first explorers/observers in those regions did not dare tell the truth to the queen and courtisans about the promiscuous sexual behaviors of penguins, that they always thought of as so "adorable". It would have offended their sensitivity or disappointed their misconception, though they themselves had no modest sexual attitudes.

At the same goes for dolphins, who can abandon themselves to masturbation, adaption of "girls" from other groups and low and behold methodically isolating such females gang raping them!

There is a lot of human in animals, or should I say animal in humans? 

Here is one such video: