A close male friend of ours has seen pics of her naked. Not just topless, but every inch of her, and even a couple of videos and pics of her in action. She does not know.
He lived in this area for several years and spent a lot of his free time with us, but moved away a couple of years ago. After he moved we started trading pics of our significant others. The first topless pic I sent him he said "I've been wanting to see those for a long time."
He dated my wife's sister for awhile, so naturally we compared what the sisters looked like and what they liked and didnt like to do. Unfortunately he didnt have any pics of her. I'm still trying to see her naked, but that's a different story.