If this is not a famous line, it should be.
 

Once the sex wears off, I give it a year, two at the most.

Maybe, it should be "wears out" rather than "wears off".

Remember this is a PG rated board.

For gardener/lawyer like relationships. Or pool boy/doctor.

Just when the relationship seems extremely unbalanced on one side or the other.

That does not fit with legal secretaries/paralegals though as some of them I have met know as much or more than some of the lawyers!!!

And some of the nurses deal a great deal better with their patients than many of the doctors.

Of course, maybe the gardener has a Philosophy MA from the University of the Sorbonne. Or has read enough to get one.

Dealing with an Asymmetric Relationship | Psychology Today

Trying to find more about this imbalance in a relationship.