Girlfriend wants to kick my b****..

My girlfriend (21) confessed she wants to kick me in the b****. What should I do?

We were having a rerun of Endgame. It came up when Gamora kneed Star Lord. She just said it doesn't hurt that bad, does it? I just ended up changing the subject. It's not that I felt weird or anything, I'm just a bit nervous.

She told me that she has a strange liking for it and would like to try it on me. I feel like trying it out too. Any of you with a similar experience?

Also, is it normal for her like it? And actually wanna do it?