SB 9.9.37
visapo dvadasabdante
maithunaya samudyatah
vijñapya brahmani-sapam
mahisya sa nivaritah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
After twelve years, when King Saudasa was released from the curse by Vasistha, he wanted to have sexual intercourse with his wife. But the Queen reminded him about the curse by the brahmani, and thus he was checked from sexual intercourse.