Mistress Matisse addresses the ancient question of what to do about emergent diversity of sexual tastes within marriage:

I can just lay out your options as I see them…

You can accept that your wife isn’t currently into this, stop asking, and not get this desire met.

You can accept that your wife isn’t currently into this, but ask her to go see a couple’s therapist with you to talk about your sex life.

You can accept that your wife isn’t currently into this and tell her that you’re going to get the need met elsewhere. (And deal with her response to that.)

You can accept that your wife isn’t currently into this and get the need met elsewhere without telling her about it.

Note that all these options begin with you accepting that your wife isn’t currently into this. I don’t know of any magic way of getting people to like what they don’t like, sexually. If I did, I would not be keeping it a secret. I’d write a book, sell a ton of copies, and be on Oprah, because mismatched sexual desires of all kinds are a huge issue in a society that claims to prize sexual monogamy.

I get reader letters too, and although I don’t tend to engage very much with the ones seeking advice the way Matisse sometimes does, I can confirm from my own mail that this sort of question is a big deal for a lot of people out there.