so hard:) Yes, it happens everywhere. Yes, it's normal for men or women to have lovers. But, 左总, is your wife ok for you to have a lover? will you be ok for your wife to have one? No offense. I guess the answer is obviously NO. So, why bother with all these "nature" or "common" talk in the cyberspace?
Only if we are open, really into open relationships, consider marriage just a license to share wealth, but having open side-relationships, maybe then we can say to others, it's ok, it's just normal. But I am not that OPEN, guess you are not either, even 阿杜 won't bragging in front of his wife about his indescribable fun.
So, why do we pretend it's normal? Nothing wrong? If you can't convince yourself and your better half, why would you try to convince someone you don't know, online?