Al-Kāfi

Hadith 1282
women
8- مُحَمَّدُ بْنُ يَحْيَى عَنْ سَلَمَةَ بْنِ الْخَطَّابِ عَنْ عَلِيِّ بْنِ حَسَّانَ عَنْ بَعْضِ أَصْحَابِنَا قَالَ سَأَلَنَا أَبُو عَبْدِ اللهِ (عَلَيْهِ السَّلام) أَيُّ الأشْيَاءِ أَلَذُّ قَالَ فَقُلْنَا غَيْرَ شَيْ‏ءٍ فَقَالَ هُوَ (عَلَيْهِ السَّلام) أَلَذُّ الأشْيَاءِ مُبَاضَعَةُ النِّسَاءِ.
8. Muhammad ibn Yahya has narrated from Salmah ibn al-Khattab from Ali ibn Hassa’n from certain persons of our people who has said the following: “We once asked abu ‘Abd Allah (a.s.), ’What is the most enjoyable thing? 5 We said other things. He (the Imam) said, ’The most enjoyable of things is sexual intercourse with women.”’
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī