Perceptions involve not only those things you project, but also how accurately others interpret those things. So, you are not completely in the drivers seat on this one, if that makes sense. For instance, in respect to myself, me having a big dick, my tendency to be a little reserved at first with people I do not know, and perhaps other traits sometimes combine to project a certain aloofness that I really dont intend or own as part of my persona. People who really know me know better. I think its good to try to be mindful of signals that you are sending, but ultimately, I have learned its best to be yourself and not worry too much about what the masses of people may be thinking. You hook up with certain people you like, you get to know each other, and you both take it from there.