I am now 71 and I regret I am alone to take my ( rectal) temperature. Thoughout my life, I have had this strong rectal temperature fetish and I have been able to share it with the dozen of girls/ladys I have had sex with.
Imo, rectal temperature taking is just a way to make love, like oral or anal sex . It has to be reciprocal.''I take yours, you take mine''. Like fucking, it can be done in a nomber of positions.
My first girlfriend was absolutely opposed to rectal temperature. She never took my rectal temperature, I never took hers. This situation was very frustrating to me during the four years of our relation.
My second girlfriend was quite the opposite. She was very much into medfet and she had set the rule that she would take my rectal temperature on her lap everytime we were to have sex. I was in Heaven.
Later,all my life partners have shared my taste for rectal temperature and they enjoyed it. But we also had lots of ''regular'' sex, including anal for most of tbem. One of my ladyfriends used to say: " my favorite thermometer is your cock".
There was one exception. For several months, I had a wonderfull rectal temperature partnership with a classy beautifull lady, who refused any kind of sex. We spent hours taking eachover's temperature, stark naked, in all kind of positions, but she never touched my ( most of the time fully erect) penis or testicles and she did not let me touch her pussy. She said rectal temperature was so fantastic, so intimate, that ''ordinary'' sex would spoil the whole thing. Also a very frustrating situation to me.