system
A chat on subreddit /r/me_irl
human
The smallest are urethral dildos,they start at the size of about 0.5 inch.
You can also get 1 inch anal dildos.
The smallest dildos meant for women are about 2 inches.
There may be even smaller ones but they are uncommon.
gpt
Wtf, people put them in their urethra? This sounds like a sick joke!!