ייִדישער מחשבֿה אויף בראשית 1:22

The precepts of this class include also the lesson that we must not injure in any way the organs of generation in living beings (ibid. 22:24). The lesson is based on the principle of “righteous statutes and judgments” (Deut. 4:8); we must keep in everything the golden mean; we must not be excessive in love, but must not suppress it entirely; for the Law commands, “Be fruitful, and multiply” (Gen. 1:22). The organ is weakened by circumcision, but not destroyed by the operation. The natural faculty is left in full force, but is guarded against excess. It is prohibited for an Israelite “that is wounded in the stones, or hath his privy member cut off” (Deut. 23:2), to marry an Israelitish woman; because the sexual intercourse is of no use and of no purpose; and that marriage would be a source of ruin to her, and to him who would claim her. This is very clear.