Only twice a week is considered healthy. Sperm is the most vital liquid of body, the more u loose it, the more u loose ur vitality or " OJAS" as per ayurveda. Excessive masturbation leads to whole body weakness, lethargy, weak memory power, dark circles, reduce facial lusture, low sperm quality,low immunity, low sexual stamina etc. I strongly recommend you for ayurveda rasayan treatment for complete rejuvenation.