It's a big problem. There's so much sexual information and entertainment and activity out there that's not between a married man and woman that people seem hooked on novelty. (Again, I'm speaking in general, not responding to a particular comment.)
I read an article the other day on a British news website about a book a married woman has written saying that married people can't expect to have an ongoing sexual relationship over many years. Since what makes sex exciting is new partners or new stimulation, married people just can't do it after a year or two. She said she'd found in *all* her relationships (red flag!) that she got bored with sex in a short time.
I was thinking, what a sad person, and how sad for anyone who's taken in by her reasoning. I know you've been married just a few weeks longer than I have (Happy Anniversary a little late!), and we both know it's simply not true that married people can't be happy in their sexual relationship, without any weirdness.
Cheers!