I'm sure at this point most people are wondering whether you are male or female, and that is very important to some people in the enjoyment of such pictures. Your gender has a question mark. Is there a reason for this other than privacy?
I think that if you honestly expect people to be upfront with you about these pictures you should tell them what gender you are. Its only fair. I don't think for example a man would feel comfortable saying these are cute feet or complimenting you if it turns out you're a man and they aren't into male feet. That would be a potentially huge embarassement to them, and it would sort of be your fault for not saying anything since this is a primarily male dominated site.
Just a suggestion for your future intentions here.