A few years ago I saw a TV story about a loving couple in Holland.
Though they were in love, the woman had no interest any more in sex. However, as hormones often will, the man still had a significant sex drive.

They discussed their differences, and relationship, and it was mutually decided that the solution was for the male to seek sexual relief through a paid sex worker. It worked, and the loving relationship continued for years. The husband had a regular "sex appointment" with the same sex worker each week for many years. (Note that the story was clear to explain that measures were taken to minimize the possibility of the husband getting a std. I believe the health side was less of an issue because the sex industry is government managed in Holland).

While many say that the sexual side of a relationship is not the most important, (or, that it is even unimportant to them) it is interesting to see just how important it becomes if their partner wishes to relieve their natural sexual desires outside the loving part of the relationship.