The Evolutionary Advantages of Primate Masturbation.

Masturbation, particularly among male primates, can increase arousal before sex and help them ejaculate faster, ensuring the success of their reproductive efforts. Regular ejaculation allows males to shed inferior semen, leaving fresh, high-quality sperm available for mating, which are more likely to outcompete those of other males. Additionally, masturbation probably helps to prevent the spread of sexually transmitted infections. The evolutionary benefits of female masturbation, if any, are less clear. Medical experts have found a range of benefits to masturbation, including stress relief, higher self-esteem, and greater satisfaction with relationships.