The neighbors have 2 boys who are 16 and 14 years of age. A lot of times they play ball and the ball goes over the fence into my yard. I have seen them climb the fence to get into my yard to retrieve it on many occasions. Over the weekend at noon I hear them playing and see some other boy who I had never seen before. The ball went over the fence a few times and they climbed over to get it. A few hours later I hear the parents tell the 16 year old to watch the other 2 and they would be back around 8:00pm. It was mid-afternoon now and I hear the boys playing. I look out my back window to see the one boy who I had never seen before climbing over the fence into my yard. Once in my yard I am watching him and he begins taking all his clothes off. He then climbs the fence and is sitting on top of it naked. The other two began laughing at what he did and with him daring to do the same all 3 of them were now naked. They were running around in their yard as well as in mine. They could have easily been seen by other neighbors but they didn't seem to have any concerns. I wondered what their parents would have said if they caught them this way. It all seemed pretty innocent until all three of them began stroking themselves. They were out there now masturbating and one by one watched each other as they shot their loads. I couldn't believe it happened but it really did. They stayed naked a awhile longer before they finally got dressed. It was a little amusing seeing them the next day, as I saw and knew what they did the the day previous but they had no idea.