It is narrated from Hazrat Ibn Abbas (may Allah be pleased with him) that I have not seen anything more resembling minor sins than what Hazrat Abu Hurairah (may Allah be pleased with him) narrated from the Holy Prophet (peace and blessings be upon him): Allah has decreed for every human being his share of adultery, which he will inevitably encounter. The adultery of the eyes is looking, the adultery of the tongue is speaking, a person’s soul desires and wishes, while the private part either confirms or denies it.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7719