Well AJ, this supports what u said:

"Monogamy is so rare in the animal world that only 3-5 % of the mammals are known to form lifelong pair bonds, like beavers, otters, jackals, foxes, some bats and a few dwarf deer and antelopes.

In fact, strict monogamy is almost inexistent, as creatures that do pair for life, occasionally have flings on the side and some, like the wolf, do not mourn too much a death or a no longer sexually performing partner."

http://news.softpedia.com/news/Monogamy-is-an-Oddity-42006.shtml

But we aren't like other animals, we don't function solely on sexual or biological desires. If that was the case, then what's marriage for ?

I'm not always right, but I'm never wrong :P - Garfield