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Definitely turtles. I once stumbled on what I assume was two turtles in the delicate act of foreplay; a smallish turtle was banging himself repeatedly and loudly (which was how I found them) on a much larger (at least double his size) turtle. They stopped when they saw me, and I felt bad for the little guy whose chance to score I disrupted.
Pic related, I had to fish that shit out of my derelict flickr account. Please excuse the color editing, I was playing around wit that stuff at the time (three years ago).
