Tumblr is well known for being the go-to place for hilarious gifs, increadible art, and free photos of hot women. All year we have been sharing with you the best that Tumblr has to offer, from amazing images of abandoned architecture to photos of animals in places they shouldn't be.  When photographers train their lenses on sexy ladies, they easily pull off incredible shots that the Internet loves to reblog. As 2013 comes to an end, let's take a moment to remember the steamiest of these photo blogs with The 40 Sexiest Tumblrs of 2013.

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