Back to the Future Photo Project (NSFW)
I found the link interesting and am glad it was posted on here.  If not the content itself, then certainly the ensuing conversation is relevant to HN.  The fact that sexuality is so taboo in our culture yet motivates humans at the most basic level is fascinating. Others question why this link and not others get so much attention, which is another HN relevant issue.  Maybe more people saw it at the same time and the sudden influx of upvotes sent it on its way.