阴道连着心？

xixi956906 发表于 6/10/2017 1:03:22 AM [url=http://forums.huaren.us/showtopic.aspx?topicid=2177254&postid=75014488#75014488][/url]

haha. I think it's biological. Men are preprogrammed to try to leave as many seeds as possible. Since they don't have to carry the fetus, it's not a big deal for them to jump from woman to woman. But for women, there's a lot more cost to have a child, so they want to have a partner to help protect her and her child during pregnancy and after she has a child. That's why they form an emotional attachment to the man who mates with her.