My wife, gave me permission to see prostitutes after the birth of our first daughter over 21 yrs ago, when she was unable to have sex for a few months.
I never took the piss, I dont go that often, I don't tell her about every girl I visit. The trick is to accept the offer but then appear disinterested in it, and when she randomly says (not often, but around 3 or 4 times a year) "shall we look up a girl for you", turn down the offer 75% of the time, even if you fancy it.
We still have sex around 2/3 times per week.