Causing one's self to have sexual thoughts: Shabbat 140b; Niddah 13b Ex-communication for one who causes himself to have sexual thoughts: Niddah 13b
One who causes himself to have sexual thoughts cannot enter into the inner area of Gd: Niddah 13b
It is better to have one's stomach split open, than to descend to "the well of destruction": Niddah 13b
The punishment for wasting semen: Niddah 13a
Comparing the waste of seed to murder and idolatry: Niddah 13a
Chopping off the hand of one who holds his member: Niddah 13b Adam creating demonic spirits with seed he accidentally wasted during his one hundred and thirty years of ex-communication: Eruvin 18b
Specific Acts
Sleeping "Perakdan" [generally assumed to mean supine]: Berachot 13b; Niddah 14a
Standing on a bed in which a couple usually sleeps: Shabbat 140b
Touching one's genitalia to check for emission of [impure] seed or for [impure] genital discharge: Niddah 13a
Holding one's member/genitalia while urinating: Niddah 13a-b, 16b, 43a
Masturbation is like spilling blood: Niddah 13b
Comparing masturbation to adultery: Niddah 13b
Touching one's self to remove a thorn from one's groin area: Niddah 13b
Wearing pants which are tight-fitting in the crotch: Niddah 13b
Donkey and camel riding: Niddah 14a
Birth Control
Use of a blocking cloth in sexual intercourse with a minor woman: Nedarim 35b
Use of a blocking cloth in sexual intercourse with a pregnant woman: Nedarim 35b
Use of a blocking cloth in sexual intercourse with a nursing woman: Nedarim 35b
