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Look at this picture.
On the left is a dog toy. On the right, a sex toy, But as we learn in this College Humour video, it's surprisingly difficult to tell the difference between the two.
Our favourite quote: "That is phallic for a dog toy but it looks like it would hurt a lot."
Play along while watching, and let us know how you get on in the comments.
More: The sex toy that can also get you pregnant