My fiancée is a prude...and body-shy.

But every once in a while she "forgets" she is.

We were vacationing in St Martin last year. I managed to convince her to accompany me to the nude beach. She told me there was no way she was going to get naked in public.
A few drinks and a few hours later, she started loosening up. She decided to go topless under the excuse that "everyone else was doing it anyway." I wasn't complaining. She realized that people were looking at her perky nipples and complained. But her complaint didn't seem authentic to me. She was "acting" her role as the prudish woman.
Later on I managed to convince her to go skinny-dipping. She agreed if she could wear her bathing suit and take it off in the water so that no one could see her naked. Again I wasn't complaining. We swam naked for a bit and decided to return to our lounge chairs. That's when a giant wave knocked us over as we reached the shore and she started putting her bathing suit back on. I tried to lift her up but she fell down again and landed on her back, legs spread eagled. I tried to lift her again, but she was pulling down instead of lifting herself up, still spread eagled. And that's when I realized what she was doing. She didn't have to be spread-eagled; she could have just pulled her legs together and used her upper body strength to pull herself up. We were at the shore, which meant everyone on the beach could see her open pu$$y. And it suddenly occurred to me that she was actually "exhibiting" herself. After the surprise of realizing what she was actually doing, I decided to participate. So I grabbed one of her legs and pulled it towards me, lifting her and opening her pu$$y and ass even more. She finally got up, faked embarrassment and said that she had just accidentally sprawled out because she couldn't get her balance. And wrote the whole incident off as "accidental open pu$$y." But I knew better. Her sly look as she said: "wow...everyone just saw me spread-eagled" told me that she had wanted that to happen after we fell over the first time and she realized that was the perfect opportunity to experiment with exhibitionism and letting everyone see her pu$$y and cover it up as an "accident."

I think beneath every shy, prudish wife, there is an exhibitionist hiding. You just have to find the right situation for it to come out.