If you mean just with some nudity, then it was several months after we started dating, and I wrote about it here
https://forum.oneclickchicks.com/sho...1&postcount=14
If instead you mean full nudity, then it was a while ago when we went on holiday in Southern Europe. We had a nice room with a floor-to-ceiling window overlooking a pedestrian area, and she showed herself from it every night and every morning, which was a massive turn-on and something we have done many more times.