Beginnings
This started in the summer of 1976.
My girlfriend and I were living in a large southern city and always had a satisfying sex life even before we began playing with others. We met when she was 18 and I was 22. At that time I was 6'2", 180 lbs. and she was 4'11" and Rubenesque with amazingly large, firm breasts. When she entered a room then men and women really noticed. She did not flaunt her sexuality at all. As a matter of fact, she came from a very conservative Southern family. If anything, she was embarrassed by her outsized breasts, but she knew they set her apart and men were especially attracted to her because of it.
At college in the late 70's, we began playing with our close college friends almost by accident. Amy, my then girlfriend, shared a house with a skinny, wild redhead named Sally. Her boyfriend George and I shared a house as well. We were constantly bouncing back and forth as couples and from house to house. One day my girlfriend and I came home from classes and our friends were in the middle of a torrid fuck. We stood outside their bedroom door listening, giggling, and getting very aroused. When they finally finished in a roaring mutual orgasm, we began whooping and hollering and applauding at the top of our lungs. Our friends were initially, very angry with us but were soon laughing too.
In addition, the four of us were not that concerned about walking around in our underwear or running nude after a shower from the bathroom to our bedrooms. It was also a time of rampant drug use. Many of these substances such as Mescaline, acid, weed, etc. were consumed almost daily, and lowered inhibitions a lot. I can't really remember exactly what led to the four of us getting naked, but we did and proceeded to swap partners. It was very strange and wonderful. To be with one naked woman was amazing but to be in bed with two beautiful but physically very different women was, literally, like a dream.
Our lady friend was built almost dead opposite of my girl. As I said, Amy was short, stacked, and voluptuous. Sally on the other hand, was thin, 5'6" ish with wild, kinky red hair and a beautiful tiny ass and small, red nipple tipped breasts. George was dark and handsome, about 5"10 and 160. Amy really liked George as a friend, but I don't know if she had any sexual feeling towards him. Sally was not my type as I generally like a fleshier woman, but I still got super turned on being with her as did she with me.