Years ago, when I was a teenager, we had two female dogs - spayed - and they would mount each other etc. etc. in the back yard, infront of the entire neighborhood and my Mom would go wild, yelling at them, calling them stupid names and they of course, would not stop. It never bothered me as I thought of it as being part of nature. One other time, I was also approached by an altered male dog when I was on the floor playing with him.... I learned my lesson quickly. The cat thing, well, so far I have been lucky. Isn't Mother Nature WONDERFUL?