So according to this article. ROUGH SEX lead to

1. male sperm is most important

2. less sex because of pregnancy

3. females live shorter and less likely to reproduce.

Oh, wait… it is not for human, just for bed bug. According to the articles, male will stap the female with his “sword” like penis to inseminate the female since they don’t have vagina.  Wow, that’s some tough love with rough sex.

This kind of behavior, I wonder why didn’t evolution take care of it.