I have nekked pics, but those were from before the days of my owning a digital camera, so they're hard copy. However, I have a set, and she has a set, and I didn't ask her to throw her's away. The way I look at it, she's in them too, so if she's proud enough to show someone else, cool with me. Also, I was thinner back then, so they're HAWT!
I'd be proud to show them off!
I'm with NG on this one... if I've given you (you being a SO) something, it's yours. Obviously, I have enough trust in you (in this situation) to have nekked pics taken, I trust your judgment and trust that you'll have enough maturity and respect to treat them they way you'd want nekked pics of you treated.