The Sin of Wasting Sperm

1) It is forbidden to emit sperm to waste [i.e. to fornicate], and this sin is greater than any other sin of the Torah. Thereby a man may not perform the spilling of the sperm outside the womb [or anywhere else], nor may he may he marry a girl too young to have children.

3) It is forbidden for a man to cause self-erection [masturbation] or to think erotic thoughts [fantasy]. If such thoughts do come to him he should discard them for thoughts of the Torah, since the Torah is liken to a “beloved hind, inspiring favour.” Thus it is forbidden for a man to sleep flat on his back, but he should turn slightly to one side to prevent him having an erection. He must not look at male and female animals [pornography] or birds [thoughts] that are copulating.

Quoted from Even Haezer Siman 23.

Quote of the Day

"Any attempt at liberation, no matter how great it might be, if it does not take into consideration the necessity of dissolving the ego, it is condemned to failure."