Matsya Purana 227.53

227.53

etāstriyastu bhāryārthe nopagacchettu buddhimān.
jñātīṃśca mātuleyāste patitā upayanti ye .. 227.52 ..

A wise man should not indulge with the above mentioned class of ladies, nor should he marry one's relation, a fallen woman, a woman in menses. He should also abstain from unnatural offence and indulging with lower animals. One who does so should keep up Kṛichhrasantapana penance to purify himself of the sin. If one discharges one's semen in water, one is to perform Kṛichhrasantapana vrata.—52-53