הלכה אויף משלי 31:3

The king must not drink himself drunk, as it says, “not for kings is the drinking of wine” (Proverbs 31:4). Rather, he must be engaged in Torah and the needs of Israel, day and night, as it says, “and it shall be with him, and he shall read from it all the days of his life” (Deut. 17:19).

Similarly, he must not be preoccupied with women. Even if he has but one (wife) he should not be found by her all the time as with the fools, and as it says, “Give not your strength to women” (Proverbs 31:3). Regarding the steering of his heart away, the Torah has already been exacting and said, “Do not veer your heart” (Deut. 17:17). For his heart is the heart of the entire Congregation of Israel. Therefore, Scriptures has attributed to him that which is written in the Torah, more so than any other member of the nation, saying, “all the days of his life” (Deut. 17:19).

Semen is the vigor of the body, its very life, and the light of the eyes, and its too frequent emission sets decay in the body, wastes its strength, and ends life itself, which is as Solomon in his wisdom said: "Give not unto women thy vigor" (Prov. 31.3). Whosoever indulges in sensuality ages before his time, his strength fails him, his eyes become dim, a foul odor issues from his mouth and from underneath his arms, the hair of his head, eye-brows, and eye-lids fall out; the hair of his beard, under his arms and his feet grow heavier, his teeth fall out, and many more ailments besides these come upon him. Doctors of medicine said: "One in a thousand die of other diseases, and the rest of the thousand from overindulgence of sex. Therefore, must man be careful in this matter, if he desires to lead a good life. He should not yield to an urge save if his body be in good health and exceedingly vigorous, with involuntary erection despite diversion, and a pressure on the genitocrural arteries accompanied by warm wave over his body, when there is a hygienic need of relief. But he should not still an urge when sated and not when hungry, but after the food in his bowels be digested. Care should be taken, before and after, whether there is a need of elimination. Neither standing nor sitting; neither in the bath-house nor on the day of bathing; neither on the day of blood-letting nor on the day of departing for or returning from a journey; neither preceding nor following all these.