Sexy challenge ideas

My wife and I have been dirty talking about wife sharing/hotwifing/cuckolding a lot lately. She gets super turned on by it, and I think eventually she'll want to try it. She is pretty shy/sexually conservative though, so she may need some warming up to it over time (the dirty talking is a great first step though). I talked her into the idea that once a week, one of us will write a few things we really want to do (can be something new or something we already do), drop it in a hat, then the other will pick one randomly. The one we pick, we have to try to do at some point not long after.

I'd love some ideas of things I can put in there to slowly push the boundary and get her to be sluttier a bit more at a time. I'm not looking for her to pick "fuck another guy" in the first week.

A couple ideas I already have
- Wear a thong bikini in public. She already has a few really sexy ones she hasn't worn in public yet.
- Don't wear a bra for a week (except at work)
- Wear a short dress with no panties to the bar
- Masturbate/show off on a live cam site (like an adult chat roulette setup) for at least one guy until he cums
- Dom me
- Spend a day controlling when I touch myself, get to touch her, when to cum, etc
- Get completely nude in the car and masturbate
- Flash me in a very public place
- Flash another guy