Thermometer in the ass when having sex

Seems more reasonable and safe as a prelude to sex as @AnthonyRT describes

Many years ago when I was young a dumb I tried it for a minute with a girl. Anyone who does it now is taking a HUGE risk. The penis will literally push against the thermometer. Also consider during sex the female gets excited. Any sudden movement can be bad.

Rubbing the clit while taking a rectal temp is much safer. Sometimes I put finger in, but very carefully. Please play safe. Take it from someone who has taken thousands of rectal temperatures. Safety is the key. @Shygirl17 and I are in this for the long haul. Carelessness can stop medical play forever.

More fun to play with her anus using my finger instead of a thermometer.... just saying, to each their own...

Having something in my ass really intensifies the orgasm for me. I've had my wife/GF's finger, dildos, butt plugs, but never an RT. Two reasons for that. First, too small to excite me and Second, they're glass. I do not want something that small and made of glass anywhere near my ass while I'm doing a lot of moving around.