If a person has sexual intercourse with his wife, but does not experience orgasm, he should wash his organ and perform an ablution.
Sahih Muslim Book 3, Hadith 102
← Previous Hadith I arked the Messenger of Allah (ﷺ) about a man who has sexual intercourse with his wife, but leaves her before orgasm. Upon this he (the Holy Prophet) said: He should wash the secretion of his wife, and then perform ablution and ofier prayer.

Sahih Muslim Book 3, Hadith 101 Next Hadith → What is your opinion about the man who has sexual intercourse with his wife, but does not experience orgasm? Uthman said: He should perform ablution as he does for prayer, and wash his organ. 'Uthmin also said: I have heard it from the Messenger of Allah (ﷺ).

Sahih Muslim Book 3, Hadith 103