Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: I have not seen anything more resembling "lamam" (minor faults) than what Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrated, that the Messenger of Allah (peace and blessings be upon him) said: "Allah has decreed for the son of Adam his share of adultery, which he will inevitably attain. The adultery of the eyes is looking, the adultery of the tongue is speaking, the adultery of the soul is wishing and desiring, and the private part confirms it or denies it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20747