Matsyapurana 70.58

70.58

tadanujñayā rūpavānyo yāvadabhyāgato bhavet
ātmano 'pi yathāvighnaṃ garbhabhūtikaraṃ priyam //

If, with the consent of that Brâhmaṇa, another handsome person come to them, these women should, with love and affection and to the best of their ability, perform all the fiftyeight kinds of observances of Love, favourite of man and gods, which would lead to pregnancy and which is not harmful to their soul’s welfare.—58-59.