This is from a Jewish website apparently no longer active. However, the Internet Archive has an archived version of the rest of this (very short) article which I’ve linked to below.
Ki Tissa: Why Moses Remained Celibate.
Moses did three things of his own accord, but which received the full approval of God.
He separated himself from his wife, because, said R. Simeon b. Yochai, Moses thus reasoned to himself: ‘If in connection with Mount Sinai, which was hallowed only for the occasion [of Revelation], we were told: Come not near a woman (Exodus 19:15), then how much more must I, to whom He speaks at all times, separate myself from my wife?’
R. Akiva said: [No!] it was God Himself who told him [to separate himself from his wife], for it says, With him do I speak mouth to mouth (Numbers 12:8)
R. Judah also said that it was told him directly by God. For Moses too was included in the injunction, ‘Come not near a woman,’ thus all were forbidden; and when He afterwards said: ‘Return you to your tents’ (Deuteronomy 5:27) He permitted them [to their husbands].
I find it rather interesting that the Rabbis should teach Moses abstained from relations with his wife, especially given this statement from the Jewish Encyclopedia:
“In post-Biblical literature Jewish opinion stands out clear and simple: marriage is a duty, and celibacy a sin.”
Jewish Encyclopedia entry on Celibacy:
“Celibacy is a sin?”
But that, of course, is the same thing the Reformers taught! Seems another curious parallel between Protestantism and Judaism.