Oh yeah! I love it big time! Years ago, I saw a young guy at the gym with white mesh gym shorts with striped boxers underneath. 2 things really turned me on. 1. I could easily see the stripes of his boxers through the mesh fabric. 2. I could easily see the outline of his penis, especially when he did the bench press. The best part was looking at how the stripes followed the shape of his penis while he was lying spread eagle on the bench. That's what made me decide to give boxers another try; now I wear them all the time. I love to go shopping wearing boldly printed boxers under white or yellow gym shorts just to spice things up a bit. It's a fashion emergency, but so much fun to catch the reactions. Here is a photo that illustrates the see through properties of white mesh. It's from my gallery, but I think it will work if you click it.
http://www.lpsg.org/gallery/showphoto.php/photo/62251/size/big/cat/500/ppuser/145819
I freeball in mesh gym shorts, and it feels great, but I never wear anything over them. I have some Jockey nylon boxers, and they have the same effect when worn under clothes as gym shorts, but are less bulky.