Err, just want to say I've never given away nude photos. oO
Shirtless is one thing but I'm not giving him or anyone else pictures of my groin, lol..

And while it's not really relevant, as a matter of interest, I usually have a generic package of reference pictures I give to artists, so, it's not like all the pictures were relevant to this particular commission. And furthermore, most of the images are actually drawings of others' characters. I see something I like that someone else drew, I take it, and I use that as an example to show an artist I'm commissioning.