Zaid bin Khalid (may Allah have mercy on him) asked Sayyiduna Uthman bin Affan (may Allah be pleased with him) that if a person has intercourse and semen does not come out. He replied: He should perform ablution as he does for prayer, and wash his private part. Sayyiduna Uthman (may Allah be pleased with him) says that (this) I heard from the Messenger of Allah (peace and blessings of Allah be upon him).