وَعَنْ أَنَسِ بْنِ مَالِكٍ رضى الله عنه
«أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَطُوفُ عَلَى نِسَائِهِ بِغُسْلٍ وَاحِدٍ»
The Prophet (sallallahu alayhi wa sallam) used to have intercourse with his wives (one after another), with a single bathing.