It all started innocently enough.
My friend Dave and I were left to fend for ourselves while our wives went on a spa weekend. We had been both been married for more than a couple of decades and had very positive and healthy marriages. As a part of that, our sex lives were fulfilling.
Our wives left midday on Friday. Dave and I decided to go to a sports bar for an early dinner. There were some good games on, our teams won, and we had a good time. Around 7:30 PM, we were ready to go. Dave looked at me with a sheepish grin and asked if I wanted to go to local strip club. In my younger days I had gone to strip clubs and never found them to be very erotic or even sexual. I decided "what the heck" let's go check it out.
We lasted a little more than 20 minutes. The girls and women were attractive to various degrees. While they acted sexual, it didn't feel very sexual, maybe because of the impersonal nature of it all.
We went back to my house where Dave was going to spend the night since we had a very early morning tennis match. Having been in the sexual environment when we got back to my house, we got into the subject of our sex lives. Dave said that their sex lives had actually gotten better over the years. I asked him what they were doing that enabled them to improve their sex lives over the last couple of decades. His answer was somewhat cryptic, "we expanded our boundaries and tried some new stuff." By the way he answered it, I was not comfortable asking for more information.
We had a good vigorous workout in the tennis match the next day. We got back in showered and dressed very casually. He had showered first so after I showered I came downstairs and he was laying on the couch relaxing.
I sat down on the floor near him. For some reason, I asked him if expanding his boundaries had included new erogenous zones for him. As background, my nipples are very, very sensitive and are always an integral part of climaxing for me.