I have not seen anything that more closely resembles minor sins (al-lamam) than what Abu Hurairah reported from the Prophet ﷺ, "Allah has decreed for the son of Adam his share of fornication, which he will inevitably commit. The fornication of the eye is the gaze, the fornication of the tongue is speech, the soul wishes and desires, and the private parts either confirm all of that or deny it."
ما رأيت شيئا أشبه باللمم مما قال أبو هريرة، عن النبي ﷺ: إن الله كتب على ابن آدم حظه من الزنا، أدرك ذلك لا محالة، فزنا العين النظر، وزنا اللسان المنطق، والنفس تمنى وتشتهي، والفرج يصدق ذلك كله ويكذبه.
Bukhari narrated it in the Book of Seeking Permission (6243), and Muslim in the Book of Divine Decree (2657:20), both through the route of Ibn Tawus, from his father, from Ibn Abbas, who mentioned it.