When I was a student (18 yo and more) I had a rectal thermometer in my things, but I'm not sure if I bought it, or if my mother did for me when I packed to leave home (for working days only, I was back every week-end).
I've been using the one at home every day I guess, since I was 14 or 15. I loved that in my ass 😃.
I found it broken in my bag when I was 25, it was a problem because there was mercury everywhere, so I called anti-poison center because I knew mercury was toxic.
They told me to go to pharmacy and request sulphur, which would mix with mercury (if my memory is good).
A few years later, when I started working, I bought a syringe with a rather short needle, and injected me with some whisky (Glenfiddich) into the left arm vein, because I wanted to do something very kinky, and see what being drunk would be like (OMG) - I had never drunk a single drop of alcohol, I was too afraid of what I might say, I had so much to hide...
I had done computations with alcohol quantity, my body weight, alcohol concentration etc to know how much I should take to be drunk.
To my disappointment, I did not feel much, neither while injecting, neither after. But nothing bad happened as well, which is good, and probably a miracle per se.
I tried whisky in my anus another time, with same syringe (but no needle !) and it only burned hard enough that I had to expel it before it might have any effect.
Now I'm contemplating buying syringes and needles to self-inject in the bottom, because I'm looking for a new partner. But it's so sad to play alone 😢, especially because I like to be dominated, forced and helpless in these games.