Vishnupurana 3.11.114

3.11.114

nāsnātāṃ tu striyaṃ gacchen nāturāṃ na rajasvalām
nāniṣṭāṃ na prakupitāṃ nāpraśastāṃ na garbhiṇīm //

"After eating his evening meal, and having washed his feet, the householder is to go to rest. His bed is to be entire, and made of wood: it is not to be scanty, nor cracked, nor uneven, nor dirty, nor infested by insects, nor without a bedding: and he is to sleep with his head either to the east or to the south; any other position is unhealthy. In due season a man should approach his wife, when a fortunate asterism prevails, in an auspicious moment, and on even nights, if she is not unbathed, sick, unwell, averse, angry, pregnant, hungry, or over-fed. He should be also free from similar imperfections, should be neatly attired and adorned, and animated by tenderness and affection. There are certain days on which unguents, flesh, and women are unlawful, as the eighth and fourteenth. lunar days, new moon and full moon, and the entrance of the sun into a new sign. On these occasions the wise will restrain their appetites, and occupy themselves in the worship of the gods, as enjoined by holy writ, in meditation, and in prayer; and he who behaves differently will fall into a hell where ordure will be his food. Let not a man stimulate his desires by medicines, nor gratify them with unnatural objects, or in public or holy places. Let him not think incontinently of another's wife, much less address her to that end; for such a man will be born in future life as a creeping insect. He who commits adultery is punished both here and hereafter; for his days in this world are cut short, and when dead he falls into hell. Thus considering, let a man approach his own wife in the proper season, or even at other times."