There is much written about what the phrase “faithful to his wife” (Titus 1:6b, 1 Tim. 3:2b) means in reference to the qualifications for an elder. It seems to me that a lot of the observations about the statement get bogged down in technicalities and intricacies and miss the sense of the text.
A key fact in understanding the text is to realise that what is being referred to is someone who qualified to be an elder of a church. It is someone who has a steady and reliable character.
Following on from our awareness of context is the awareness of how the text can legitimately be rendered. “One woman man” is very much within the bounds of legitimacy and fits the context very well.
The characteristic we are looking then is part of the photo-fit which defines someone suitable for eldership. That man is to be devoted to one woman. He only has eyes for his wife (although if could reasonably referred to fiance or girlfriend). A flirtatious man reveals a man to be unsteady and unreliable and that would be unbecoming of an elder. Such a man is not fit for eldership.
So we need men who are utterly devoted to their wives. They find all their delight for fellowship, companionship, support and sexual fulfillment in this one woman. This woman has no doubt that all his affection is upon her. How men need to cultivate this so that their eyes (and hearts) do not wander. And of course we need to pray.
It is a beautiful thing to see a man devoted to his wife after 40/50/60 years of marriage. That has to be cultivated; it does not just happen.