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I don't make any assumptions about anyone's married life, but then I don't spend much time speculating about the sex lives of my friends.
Ok. If you choose not to apply what you know of the human race (being one yourself) then maybe for you I need to appeal to what the bible says about marriage:
1 Corinthians 7: 1 - 5
Now for the matters you wrote about: It is good for a man not to marry. But since there is so much immorality, each man should have his own wife, and each woman her own husband. The husband should fulfill his marital duty to his wife, and likewise the wife to her husband. The wife's body does not belong to her alone but also to her husband. In the same way, the husband's body does not belong to him alone but also to his wife. Do not deprive each other except by mutual consent and for a time, so that you may devote yourselves to prayer. Then come together again so that Satan will not tempt you because of your lack of self-control.
Mary was a wife, and all that that implies, biblically speaking.
This is not real complicated, unless one has ulterior motives for making it so.
Probably most of them don’t have much of a sex life...smile.