Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) said: I asked the Prophet (peace and blessings be upon him) about a man who gets some impurity from a woman and then becomes slack (without ejaculating). He (peace and blessings be upon him) said: "He should wash it, then perform ablution and pray."
(b) In another narration, he (peace and blessings be upon him) said: "He should wash his private part and perform ablution."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4132
Sayyidah Aishah (may Allah be pleased with her), speaking about the fluid that flows from a man and a woman, said: The Prophet (peace and blessings be upon him) would take a handful of water and then pour it over it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4133
Sayyidah Aishah (may Allah be pleased with her) said: It is appropriate for a woman, when she has reached maturity, to keep a piece of cloth; then when her husband has intercourse with her, she should give it to him so that he may wipe himself clean with it, then she too should wipe herself clean, and then they may pray in those same clothes which no filth has touched.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4134
Sayyidah Aishah (may Allah be pleased with her) was asked: May a man pray in the clothes in which he has had intercourse? She said: A woman should prepare a piece of cloth for her husband so that he wipes away the filth with it and it does not get on the clothes. If he does that, he may pray in those same clothes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4135