One thing not mentioned in this thread is the possibility of a UTI. I normally sound with shorter items, like crocheting needles, that can hit the prostate and feel very pleasurable. I've been doing it for years. I just clean with rubbing alcohol.
More recently, I bought some longer silicone sounds that could reach the bladder. I made sure to boil in water to sanitize when I first got them and my first sound went great.
The 2nd time I used them, I just cleaned with rubbing alcohol, like I did before, and a couple days later, my abdomen was sore and I realized I got a bladder infectio