My wife only has sex with me when we're trying to conceive. Meanwhile, I have such a strong sex drive that I can't relax unless I have sex every day. Even my obstetrician has warned me that I should practice some abstinence, or my sperm quality will decline. I try my best to hold back, but every weekend, my wife's younger sister comes over and takes every drop of my pent-up semen. This is my life now.