Because we like to have as many as we can. If we can pull it off, that is. It's usually because they're really isn't just one that we want. Sure guys are willing (usually) to submit to one and get married, but they still check out other girls. (But hey, it's not like girls don't check out other guys too.) The more, the marrier, if we are able to pull it off.
Why do girls consider all guys to be perverted sex-hounds or pigs when they want the same thing?
H-D 