"The Messenger of Allah said: 'When the two circumcised parts meet, and (the tip of the penis) disappears, then bath is obligatory.'"
Sunan Ibn Majah Book 1, Hadith 345
← Previous Hadith The Messenger of Allah said: "When a man sits between the four parts (arms and legs of his wife) and has intercourse, then bath is obligatory."

Sunan Ibn Majah Book 1, Hadith 344 Next Hadith → The Prophet said: "If anyone of wakes up and sees some wetness, but he does not think that he had an erotic dream, let him have a bath. But if he thinks that he had an erotic dream but he does not see any wetness, then he does not have to take a bath."

Sunan Ibn Majah Book 1, Hadith 346