Linky?
ETA: Suitably broken, of course…
I recently watched the abysmally bad episode of *Inside the Actor’s Studio *in which James Lipton interviews the master thespian Jennifer Aniston. While she has no discernable personality to speak of, she did have a funny line about filming sex scenes. She referred to the use of a pillow to keep the naughty bits from coming into contact, and said she didn’t like to use them because they make the guy’s butt look unnaturally higher than it should be. Then she said, trying to be circumspect about the reason for the pillow, “it goes down when the camera stops rolling, anyway”. The audience howled.
Naked animals? WHY THAT’S JUST GOING TOO FAR! 
George C. Scott is commonly reported to have told an actress before a sex scene, “I apologize if I get an erection, and I apologize if I don’t.”