Hadith 31-115

وَبِهذَا الإِسنادِ قالَ: قالَ عَلِىُّ بْنُ أَبِي طالِب‏ عَلَيْهِ السَّلامُ: ثَلاثَةٌ لا يَعرِضُ اَحَدُكُم نَفْسَهُ لَهُنَّ وَهُوَصائِمٌ: الحَمّامُ وَالحَجامَةُ وَالمَرْأَةُ الحَسناءُ.

According to the same documentation, Ali ibn Abi Talib (a.s.) said, “You should avoid the following three things while you fast: Bath, phlebotomy (blood-letting) and beautiful women.”