We've had a quick word with our supplier, and they were as mortified as us that this slipped through, so it'll be gone by the morning - the site updates at midnight.
They run another site and much of the stock is duplicated across the two, but their NSFW content isn't supposed to be on our site at all. This one slipped through the net, but I believe that they're removing it from both sites, as they don't find it particularly amusing or appropriate either.
Thanks for bringing it to our attention, and apologies for any offence caused. It wasn't intentional!