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In some human societies, sexual behavior akin to these animals would be shunned.
Males want to mate with as many females as possible with the goal of fertilizing the most eggs.
Females are a little more selective, preferring to hook up with the best males to fertilize their eggs.
For polygynous horned beetles, the same trade-off exists between allocating resources to developing mate-winning weaponry in the form of horns and having more sperm to increase fertilization.
In one study, when researchers cut off the beetles' horns, the pupa reacted by developing larger testes, supporting a theory known as resource allocation trade-off.
In a study of a mouse-like marsupial, scientists found that by sleeping around, females had a better chance of finding males with good-quality sperm and high sperm counts [video].