The Prophet (May peace be upon him) said : When any of you has intercourse with his wife and desire to repeat it, he should perform ablution between them.
عَنِ النَّبِيِّ ﷺ قَالَ إِذَا أَتَى أَحَدُكُمْ أَهْلَهُ ثُمَّ بَدَا لَهُ أَنْ يُعَاوِدَ فَلْيَتَوَضَّأْ بَيْنَهُمَا وُضُوءًا