My husband needed four of us to keep him happy - co-worker for the sexting, EA partner for his emotional needs, ONS for the sex and me to keep his house, bring in a paycheck, raise his child, and handle his social obligations (oh, and for the sex and emotional needs and sexting).
Some people just feel entitled to have it all with a minimum of effort on their own part. And they want to keep it all once they've figured out how to have it - no matter how it effects anyone else.
It's not about being female or male. It's about being a cheater.