According to my senior researcher(A), his friend(B) got a company's job offer. His friend(B) made friends with those who also got the same company's job offer. Then, he(B) got the mail address of a female one.
He thought he(B) was loved by the female. So, he(B) was pleased and has sent e-mails to her frequently. But, the female he(B) loves replies about twice a day. He(B) is concerned with how few times she replied to him(B).
I'm surprised at the fact that there is a man who is more unfamiliar with how to contact females than me in my department.