i believe that the 'legitimate' photo societies also organise model shoots who are wearing swimwear. to each his own. seems more normal than stalking and shooting wild birds ;p
maybe some people do take portrait shots but do not post on clubsnap simply because the models have asked for privacy, and don't want the pics grabbed and posted in some questionable site.
maybe some people do take portrait shots but do not post on clubsnap simply because the models have asked for privacy, and don't want the pics grabbed and posted in some questionable site.