Mutually agreed upon relationships are fine, whether or not they're exclusive.

Curiously enough, there are more than a few animal species which mate for life, while there are numerious others which are quite indiscriminate in their mating behaviour. There are also some species in which homosexual behaviour is rather common (giraffes, for example).

People demonstrate far more variety in this respect than most animal species, suggesting to me that while we are closely related to animals, we have developed into something a good deal more sophisticated in its behaviour than any animal. The possibilities in life are tremendous for human beings, and so are the risks.

- LH