'Uthman bin Maz'un was a close companion of the Prophet. One day his wife came to the Prophet and complained, "O the Messenger of God! 'Uthman fasts during the day and stands for prayers during the night." In other words, she meant to say that her husband was abstaining from sexual relations during the night as well as the day. The Prophet was so much angered with this that he did not even wait to put on his slippers. He came out with the slippers in his hands and went to 'Uthman's house. The Prophet found him praying. When 'Uthman finished his prayers and turned towards the Prophet, the latter said, "O 'Uthman! Allah did not send me for monasticism, rather He sent me with a simple and straight[shari'ah]. I fast, pray and also have intimate relations with my wife. So whosoever likes my tradition, then he should follow it; and marriage is one of my traditions. (Wasa'il, Vol. 14, p. 10) Since 'Uthman was already married, the word "marriage" in this hadith can only be applied to sexual relations.
In another incident, three women came to the Prophet and complained that their husbands were abstaining from meat, perfume and intimate relations with their wives. The Prophet quickly came to the mosque, went on the pulpit and said, "What has happened to some of my companions that they do not eat meat, they do not use perfume and they do not go to their women?! Whereas I eat meat, use perfume and go to my wives. Therefore whosoever dislikes my tradition, then he is not from me. (Wasa'il, Vol. 14, p.4)