As
@Hugo20 and
@1NiceRod I wear a metal cockring all day long without problem. You just need to find the correct size of the ring matching your cock.
Normally there is absolutely no problem when you are flaccid, a problem could arrive when you get full erection with significant restriction of blood flow as said
@_mfrankb_ .
I should say "never start directly with a metal cockring that you couldn't remove in urgency".
At the beginning of my cockring experience, in a party with my boyfriend and a couple of very good friends, I got a bigger erection than usual : my dick started to get full red-purlish! I had to escape a few minutes to have a cold shower in order to be able to remove my cockring. Then I could join again my partners.
Since that experience, I added 5mm to the diameter off the cockring I choose. I feel weel with 50-55mm diameter that I keep sometimes 24/7 with no more problem. About 30 years in cockring practice !
Most of time classical metal cockring that I keep flaccid and in full erection.
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The same recommendations apply for the glansring