On weekends I spend time around my house mostly doing repairs or yard work. Once the work is done I usually grab a beer and relax. The wife was out spending the day with one of her girlfriends so I was home alone. I look over into my neighbors yard and I see my neighbor topless with her breasts fully exposed. She saw me looking and thought nothing of me seeing her that way. On her way back into her house we quickly chatted with her breasts still fully exposed to me. She said she didn't want to be rude but had to be going to meet a friend. About a half hour later she comes out of her house and drives away in her car. Thinking about her breasts and realizing no other neighbors were around I decided I might try stripping down. Seeing her nude made me want to try it that day. I have been nude on some beaches but never around the outside of my home so it was going to be a first. I always worried what people would think of me if I was every caught. I went into the house got undressed and came out into my yard naked. There were only two neighboring house that could see into my yard, and with one of them away now, it wasn't too big of a thing to do. I sat on one of my lounge chairs and had a few beers. It was about an hour or so later from the time I went outside naked that my wife unexpected came home. I didn't know what she would say and when she saw me said nothing and came over and sat on one of the other chairs. Along with her was her girlfriend. I was face down so my junk was exposed to them but my ass was. I had nothing to cover up with so I asked my to get me a towel. She dismissed my request with a quick reply that it wasn't required. It appeared she wanted me to remain naked and I didn't know if it was to get back at me for trying this or if she just didn't mind. She then told me she needed to talk to me about something and wanted me to come inside with her. This would mean I would have to stand up and her girlfriend would see my junk. I figured if I got up quickly I could cover myself with my hand and she would only get a quick flash of me. I did it and when I got inside my wife asked why? Before I could answer she said she liked me this way as it was an easy way to let her friend see for herself everything that was said about me. I asked what about me talk about and she wasn't too specific. Before we were about to go back out I told her I better get some clothes on. She very adamantly told me I was going out the way I was and told me to get moving. My hand went back over my junk and she moved it away telling me I had nothing to hide. I walked out more exposed this time and sat there with the two of them and my junk fully exposed. It was embarrassing at first but I soon it was a non issue. My wife and her girlfriend only stayed for about an hour before they left to go out and do some shopping. That night after my wife got home she said it was fun rubbing into her girlfriend's face how I was bigger than her husband by at least an inch. When I asked how she knew, she said she had seen his before. I didn't know if I liked that or not and told her. She has seen him that way many times. She goes on to say he may be smaller but less shy. She even tells me she has seen him masturbate. I really didn't know if I liked her seeing another guy doing that. The more we talked the more I found out things. He walks around naked a lot and has masturbated in front of her many times. I asked how she would like it if her girlfriend saw me masturbate. The reply I was given was that she wouldn't mind and asked if I was offering. She thought it could be pay back for all the times she saw her husband do it. What really caught me by surprise was when she said that maybe her girlfriend would masturbate for me to payback for all the times she masturbated for her husband. I asked about the masturbation and asked if he had seen her naked. She answered he has and even goes naked quite a bit while at their home. I was very blunt and asked if he had seen her c**t. She answered yes and told me he hasn't fucked it if that was what I was worried about. I asked if nothing at all happened? She said no fucking but maybe a little sniffing, a lick or two and some fingering. My wife was getting annoyed by my questions and suggested I visit with her next time. I did visit with her and the four of us got naked. My wife masturbated if front of us and then her girlfriend di the same. Her husband began licking my wife's pussy and her girlfriend got on top of me and we began fucking. My wife was not happy at all, screamed some obscenities at me and walked away. The husband didn't mind and once I was done with his wife he took his turn with her.