[Machine] On the authority of the Prophet ﷺ, he said, "If a man sits in the middle of her four limbs (referring to his wife during intercourse) and the circumcision touches the circumcision, then ghusl (ritual bathing) becomes obligatory." This hadith is narrated by Muslim ibn Ibrahim. In another narration by Wahb ibn Jarir, it is mentioned that if a man sits in the middle of her four limbs and then experiences intense pleasure, then ghusl becomes obligatory. And in a hadith narrated by Abu Nuaim, it is mentioned that he (the man) exerted himself (during intercourse)  

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا قَعَدَ بَيْنَ شُعَبِهَا الْأَرْبَعِ وَأَلْزَقَ الْخِتَانَ بِالْخِتَانِ فَقَدْ وَجَبَ الْغُسْلُ لَفْظُ حَدِيثِ مُسْلِمِ بْنِ إِبْرَاهِيمَ وَفِي حَدِيثِ وَهْبِ بْنِ جَرِيرٍ إِذَا قَعَدَ بَيْنَ شُعَبِهَا الْأَرْبَعِ ثُمَّ اجْتَهَدَ فَقَدْ وَجَبَ الْغُسْلُ وَفِي حَدِيثِ أَبِي نُعَيْمٍ ثُمَّ جَهَدَهَا