i think if you read the last post in those threads, an explanation is usually given for the closure. this is not always the case, and it's rather annoying when a thread is shut down for no apparent reason, but i'm pretty sure the body shot closers did explain themselves.
THe second to last one was shut down because everyone got their panties in a bunch over pictures of two naked men. Not sure what happened to the most recent one
if you're an exhibitionist, seems like posting your boobs where nobody will ever see them would be kind of pointless. i don't know, but that sounds like a politically correct term for a jock strap.