Which man is most harmed by excessive sex?

　　Ling is the kind of girl with plump figure and curves. When I first saw her appearing as a waitress at the Jingli Hotel, I was attracted by her beauty and innocence, and I frequently attacked her. As a hotel security guard, I always showed up in time when she needed help the most. I helped her resolve the embarrassment of being entangled by guests many times and won her favor. Last Valentine's Day, I mustered up the courage to confess my love to Ling, and she happily accepted it. In my single dormitory, I clumsily untied Ling's clothes and kissed every inch of Ling's skin passionately. When I entered the depths of Ling's body, I heard her let out a cry of pain.
　　
　　Looking at the fallen red on the sheets, Ling suddenly started crying sadly. I quickly comforted her with words and told her a few funny jokes, and she finally burst into laughter. Ling's body is so beautiful, so beautiful that my heart is intoxicated, so beautiful that my heart flutters, so beautiful that my passion surges and I can't control it. I am inseparable from Ling, and Ling is the same to me. We wish we could become one. That day, Ling and I had hearty lovemaking for the second and third time amid deep love.……
　　
　　Soon, I was promoted to hotel security manager. Ling and I discussed renting a house for the time being. Ling, who is skillful in decorating, made our 20-square-meter cabin warm and welcoming, filling it with a strong home atmosphere. For those of us who have unveiled the mystery of sex and tasted its breathtaking and ecstatic charm, making love has become the main theme of Ling and I's night life. We regard our youth as our capital and have sex 5-7 times a week without feeling any physical discomfort.
　　
　　In order to do a good job in hotel security management, I took the self-study exam for the undergraduate level of "Public Relations". At my suggestion, Ling also signed up for the self-study exam for the associate level of "Business Secretary" to prepare for a more ideal job in the future. Before we lived together, I had a record of passing all four subjects in one exam. Since we moved in together, even if I read a book once in a while, I wouldn't read two pages without yawning all the time, which was very ineffective. Ling complained that her memory was not as good as before and she couldn't concentrate when reading. As a result, in the exam at the end of October that year, all the subjects we took were wiped out. Such a result almost made Ling and I lose the courage to continue self-study.
　　
　　Now it seems that the failure of the self-examination was the first revenge for our repeated sexual intercourse for a long time. We didn't realize this at the time, we just thought we didn't study hard enough. Because repeated sex caused a lot of physical exertion, I was once again absent-minded in the security work of checking in foreign guests, which caused a foreign guest's room to be stolen, which caused a very bad impact. In this incident, although I was not demoted, I was severely reprimanded by my boss and had my bonus withheld for two months.
　　
　　Even so, Ling and I still insisted on having sex repeatedly. Subconsciously, I have taken it as proof that I have strong sexual abilities. However, my physique has been significantly weakened.