There is science to say that it can be found in human genital secretions. It has been shown to be sexually transmitted in a number of different animals—dogs, horses for some reason, cats, and mice. There are also studies that failed to document it, but I think at this point the precautionary principle would be to say, yes, we can see it happens in animals and it looks as if it could happen in humans.
So yes, let's not take a risk.