Sexual intercourse did not affect prostate cancer risk. But frequent masturbation did -- in different ways, at different times of life. Frequent masturbation during men s 20s and 30s increased their risk of prostate cancer, For men in their 20s, frequent masturbation was two to seven times per week. Compared to same-age men who reported masturbating less than once per month, 20-something frequent masturbators had a 79% higher risk of prostate cancer by age 60. For men in their 50s, frequent masturbation was one or more times per week. Compared to same-age men who reported never masturbating, 50-something frequent masturbators had a 70% lower risk of prostate cancer. You should do aerobic exercise at least 30 minutes per day for 5-6 days out of the week. Aerobic exercise is the best type of exercise for disease prevention because it has all sorts of health benefits, including improved circulation, a healthier immune system, and increased energy levels. Try aerobic exercise such as biking, swimming, running, dancing, spinning, and rowing. You should also make an effort to become more physically active in your day-to-day life. Take the stairs instead of the elevator, park your car further away from work, or use a standing desk instead of a seated one. now you don t worry about your problem. shrinkage of penis occur because of depletion in hormones. Sex requires energy, the more sex you have, the more energy you use.you should eat proper iron,calcium diet and maintain posture proper.avoid forward movements of back. When sexual exhaustion occurs, the penis may not be able to become erect and can also appear smaller in length and circumference. Excessive masturbation can wear down the nerves allow ejaculate to be expelled during sex. This can cause early ejaculation or even cause you to ejaculate while sleeping. If you want to restore your penis to its original size, you should stop masturbating and reduce your sexual activity until your penis and sexual organs have had time to rest.