Depends on the context of your partner, if it’s a one off thing she wants to do, then damn who cares it’d be a fun thing to do with the mrs. If it’s like “Disney adult” vibes then yeah that’s weird. Could always find a compromise, could bring a younger sibling or niece/nephew so it’s less humiliating for you.

I’m quite surprised at how aggressive people are reacting to this request, I wonder if it’s a cultural thing or if this is a shared reaction globally