4. Sex decreases aging. “Use it or lose it” has never been more applicable. Regular sex releases a plethora of “happy” chemicals into your bloodstream, including testosterone. As we age, our testosterone levels decrease. Sex is a wonderful way to build your reserves back up, helping build new bones and muscles while putting a youthful glow on your face. According to a study by Dr. David Weeks, a clinical neuropsychologist at the Royal Edinburgh Hospital in Scotland and co-author of Superyoung, men and women who reported having sex an average of four times per week looked approximately 10 years younger than they really were.