i've slipped up and not worn a rubber with a few chicks that i most definetly should've been using one with. that was quite a few years ago though, and my dick hasn't fallen off or changed colors. i've only had an HIV test since, but my gf was tested a few times for everything when she was pregnant with our son. since she didn't have anything and we have been faithful to each other, i must not have anything either.
still wear 'em occasionally even though we've been together for almost 5 years. i'll grab one if i know i'm not going to feel like pulling out. works for me.