Dr. Gregory Bulté uses hidden cameras to record the private lives and have gone as far as posting online some of the zesty bits. For this reason Dr. Bulté calls himself a “Turtle Voyeur”
To read more about the work by Dr. Bulté in his article on The conversation here: I spy on turtles to learn more about how they have sex
Also see a video clip below taken Dr. Bulté where a male map turtle chooses his mate based on the size of of his potential mate.