I know somebody raised a similar question a while back but mine is quite different. I'm female but sometimes I wonder if God really meant for men to be monogamous? If you look in the Bible even those great men He blessed had more than one. Look at Abraham and his wife's maid, look at David who sent someone to be killed so that he can have his wife, look at Solomon and his many wives and concubines? Yet God still singled these men out and blessed them greatly. I know they were all in the Old Testament but that doesn't change the fact that they were greatly blessed and till today they are the ones Christians remember, and use as a point of reference when praying.
I know that when a woman loves a married man everybody hates her and calls her names but things are not so black and white, besides it's not all men that set out to break their vows and hurt their wives, some of them genuinely love the wife but still fall in love with someone else. Some men are capable of loving and caring for more than one woman. All these things make me wonder if this isn't how God intended things to be.