Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. Body produces semen whenever it is sexually aroused. Such semen will be kept inside the scrotum. that is a waste product and should be eliminated. Body has its own mechanism to eliminate the waste product. One way is through night fall. Night fall takes place if you do not masturbate or indulge in sexual activities. You can safely indulge in masturbation twice or thrice in a week to prevent night fall. For your information both masturbation and night fall are normal and you have nothing to worry. Hope this answers your query. Available for further clarifications. Good luck.