[sebbie]

My suggestion would be that instead of wearing clunky board shorts over the thong, instead get yourself a pair of jammers or even a pair of athletic style compression shorts. Either kind that fit really snug are good, I always undersize a bit.

The thong will work quite nicely as a liner, and the constant gentle tension of the back of the thong between your glutes as you move around will feel great. Plus, the thong pouch should be snug enough so that you can position yourself forward and up inside of it--a position you might be reluctant to try if you were wearing just the thong. This gives a great outline inside the jammers/compression shorts and you should be ultra-sensitive and horny in an instant. Your wife should figure this out quickly I would think.

If you want to go with just the thong simply remove the jammer like you would have removed your board shorts and dive into the water.