For the gents, I imagine we get spoiled, being able to "custom order" our sack time based on our own selfish fantasies.
For the ladies, I imagine you get accustomed to the gift envelope as part the festivities. It provides a kind of "permission" that you can't duplicate with mere words. Even with a talented lover, on some level, it must be a let down when the envelope is no longer there.
I don't know anyone who's been deeply involved in the hobby who was able to return to a vanilla (monogamous) relationship. Not that I know the details of every couple I'm friends with, but I was just curious.
It's not necessarily a bad thing, it just is what it is.