At 71, I have been having a strong rectal temperature fetish thoughout my all life and most of the women I have been living with have shared my fantasy.
One exception was my first girlfriend back in the seventies. . Christine was absolutrly opposed to rectal temperature taking. She found it discusting and a clue that I might be gay.
Fortunately, my second girlfriend, a few years later, was just the opposite. Maria was very much info medfet and she had set the rule that she would impose on me a comprehensive physical, ending with her taking my rectal temperature on her lap, every time we were to have sex.. I was in Heaven.
Later on, as an older man, in my 60's, I had a ten years long relation with Deborah, a ladyfriend, much younger than me, who was as much into rectal temperature as me. When the Covid crisis erupted, she decided to move in with me, in ordre to take care of me, at risk with the virus at 68. She decided that we would take our respective rectal temperature on eachover's lap, every day, first thing in the morning. Lots of fun for the two of us. We kept more of less this rule till she dumped me, two and a half years ago.
Now, I am alone with my memories to take care of my temperature. LOL.