Then just call every wife out there a whore, because that is what you are doing in repeating that ridiculous statement/cliché.
I think it was a joke ... “nothing’s free” kind-of thing.
But, there’s probably not a wife out there that hasn’t given a “favor” (of some variety) to get her husband to run an errand or something (... “OK, but later you have to mow the yard.”)
Within the confines of marriage, certain adult negotiations between a couple hardly make the transaction tantamount to prostitution (you were gonna have to mow the yard anyway, and both of you were going to *ahem* anyway ...).
SnakeDoc