I had some pictures of my dick on my Blackberry that I forgot were there. I was showing some of the women I work with some other pictures I had on there and they ran into my naughty ones. They were surprised, and hopefully impressed. I wasn't embarrassed at all. I took them when I was away on business and had texted them to my wife. I thought I had deleted them all but I guess I missed a few.
lol i have a story about that. Not on a camera but on my boyfriend's computers screen saver. The screen saver had been set to flip through a specific folder of pics - we had been keeping a separate folder for my nude/naughty pics but apparently we had missed one picture when we transferred them to their new folder. One night my housemates were having a large party and were using my BF's computer for the music. Needless to say the screen saver turned on and sure enough about 50 people in the immediate area were flashed a picture of me mostly nude (several times as the program cycled through the pictures and I wasn't in the room to notice when they turned it on). Luckily it wasn't ever mentioned again - i think mostly a combination of people not really paying attention to the pictures coming up as well as the booze.
My advice is to move on from the incident. Yes it is horribly embarrassing and it possible it offended whoever saw it but I would think the odds of that are pretty small. I mean who hasn't taken a nude pic of themselves or someone else? nearly everyone i have ever discussed it with has - its not like you were doing something wrong or wildly inappropriate. Most likely your friend or family member feels a bit awkward about it too but if a little embarrassment is all you have to worry about I would just chalk it up to Murphy's law and let it be. Apologize if it seems necessary but you can't go back and change what happened and honestly in the scheme of things its really not a big deal. good luck.
A couple of years ago, my wife handed my lap top to one of my female cousins so that she could view some photos we took while on vacation. She had forgotten that I had left some photos of the two of us enjoying sexual pleasures with a couple that we had met. When my cousin came to them, she acted as if everything was natural. Later, she approached both of us privately and told us that she had become sexually excited while viewing those nice pictures we had. She continually touches the wife and smiles at me as well as "accidently" touching my crotch area. I think she wants to join us in a threesome.