My avatar is of the lovely Esmeralda, from Disney's Hunchback of Notre Dame, based on Victor Hugo's lovely novel. I think the picture is alluring, without being smut- as I'd hope you wouldn't get smut from a Disney screenshot. Which is what I'd like to classify myself as, alluring without being smut. I grew up, and still am at heart, a Disney child. As such my avatar reflects that kid in me, but also the obvious sensual side.
Also- with the 'Lady' name tag being red, I like to keep the color scheme going through the entire sidebar. Even if I loved a picture, if it clashed with the Lady name tag I'd instantly reject it- it's part of my slight OCD.