Evolution

There's a simple and genetic reason why female promiscuity is considered worse and male polygamy more acceptable: fatherhood. A man can never be 100% sure that the child is his and will not care for the child the same way if it isn't. A man needs to trust his woman in order to be reasonably sure of this and the more women sleep around, the less support, protection, commitments and offers for marriage they will get.

Your female sexual freedom is only causing you to be used and dumped more often. Enjoy.