I stick things up my peehole since I was a teen.
then there was a long break and I discovered it again in the 50th.
Started with my wife who had a tiny hole what is now stretched so my thick fingers (thumb not yet) can go all the way in - until my finger can pat the bladder wall.
That turns us both on immensly and makes her orgasm like crazy.
A few months ago I decided I wanted her doing me also and that was when I had to cut my glans open. My peehole was through other abuse of the glans meanwhile so small that a 4mm just fit.
I could pee several meters, now I pee like a girl
Two months ago the 10 mm knitting needle just barely fit and now I am being around 12 mm.