Bring it up to her? Does she know? I am a tiny bit confused. But I'm sure she will work things out if you are level-headed and maybe find out what her fun ideas are; who knows? Romance has a potential forever possibility with creativity and spicing things up.
But I don't know the personality factors involved. We all know, outside of diaper wearing, what is cool to do with our other halves and what isn't. (I'm a whole, but I was there once).
What we can get away with, and what we can't. Maybe it's time for a gentle easy fun evening of something that helps make it easier to talk about. I personally would take them camping. Perfect excuse! "Boy, it's cold out there! I ain't runnin' out freezin' my..hey! I have the solution! And it will be fun and goofy to do! I'll be back in a second..Just wait..." lol. Then, "Here. Let's play! let's spice things up!" and make sure you have really good gourmet snacks hidden away, too. Other things she really likes, if needed. Make it fun.
But it depends on the personality factors.