This thread made me remind me of a memory of my youth.
In the begining of the 1980's, I lived my only treesome experiment when I got my first work assigment in a remote African country. I shared a house with a couple of expats. Françoise, a teacher, and Daniel, an archeologist, were nice and cool. We quickly became friends, and more ..We spent days and nights together, and we had a lot of sex
One of the games we develooped then was Daniel and I, on our stomach on the couple's bed, having our rectal temperature taken simultaneously. The guy having the highest temperarure would be allowed to fuck Françoise first. The girl sat between the two of us and hold ( or play with) the thermometers. Once, she left us with our thermometers in our rectums, to take a Polaroid photo of the two of us. She considered we looked ''so cute and so vulnerable'' with our themometers sticking out of our asses. I wish I could see this photo again today
We came out with a kinkier version of this game. Before taking our temperatures, Daniel and I would lie on our back and Danielle, seating between the two of us, would use her two hands to masturbate at the same time her boyfriend and me. After orgasming, the two boys would roll over and get a thermometer in their rectum to assess the effect of masturbation on their temperature.