If a guy masturbates too often, he will suffer the consequences. Do the same consequences apply if a guy has sex too often? If not, why does forgetfulness and such happen only during masturbation, but not from sexual intercourse?
Mary Ellen, Many men who use repeated masturbation in order to achieve satisfaction also seek out drugs that are supposed to be sex stimulants. Some recreational drugs, namely alcohol and marijuana are supposed to be drugs that can help a man to enhance his sexual performance. A man who takes the time to masturbate on a regular basis might also make a point of using supposedly sex-enhancing drugs.
If a man repeatedly takes-in or uses sex-enhancing drugs, and if he then enjoys masturbation look what happens. He has removed a fair amount of the liquid in his body. That will lead to a concentration of the drug(s) in his body. Such a concentration could well cause the same man to suffer unwanted health effects, such as forgetfulness.
A man who masturbates tends to be alone on a regular basis. Being alone, he has more chances to use sex-enhancing drugs. A man who has frequent sex is less often alone. He therefore has fewer opportunities to engage in drug use.
Drug use, rather than masturbation, can have important health effects. At times repeated sex can have an effect. There are cases of sex addiction, but that will be covered more fully in the response to a later question.