Sunan Abu Dawud
219
Hasan+2

Narrated AbuRafi': One day the Prophet (ﷺ) had intercourse with all his wives. He took a bath after each intercourse. I asked him: Messenger of Allah, why don't you make it a single bath? He replied: This is more purifying, better and cleaning. Abu Dawud said: The tradition narrated by Anas is more sound that this tradition

HasanAl-Albani
HasanMuhammad Muhyi Al-Din Abdul Hamid