Yeah, it's pretty common. Really it's kind of ridiculous to be so pick though...I mean, it just so happens that MOST organisms are asexual.
And it's not always a show of dominence....I'm pretty sure you just said that because it sounded good. The penguins someone else mentioned, for example, do everything a normal penguin pair would do.
There are groups of chimpanzees who will basically perform every type of sexual act people will do and are largely bisexual.
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