Geezus, IT WAS NOT PORN ! It was a link to a joke site of a guy on a motorcycle making farting noises and his butt was slightly hanging out, in a funny way, not a porn way. It was funny as hell. Apparently it offended some people so I edited my original post. End of story.
The only reason I took interest initially is because I ride. I'm pretty sure I have seen the image you are talking about. It is funny as hell!