Ah, It has an intresting effect because I wear a Metal ring
http://www.stockroom.com/Lockable-Cock-Ring-P1801.aspx
It makes it difficult (but not impossible) to get an errection
Because of the pressure on the top base of the penis
Also it pulls on your balls.
There are two problems I had to solve though
One the Hinge- kinda pinches a tiny bit and can get painful
so I put a nylon sleeve I cut out of a silk stock so that problem is elimintaed
the bigger problem is the to, lock area, Which can Pinch at Lot, Very painful.
Also without a chastity cage to secure it close it can open a little, and then there is the very painful pinching,
So After I lock it,
I wrap a rubber band or hair barret around the two closed posts.
Then I walk around without underwear
Now my dick is pulled away and often brushes agains my clothes
(at least the tip does)
But the stimulation is not enough to get me errect
because of the pressure on my penis (Actully tiny, bit painful if you do get errect)
(But when you do You are REALLY hard, I mean like painfully hard)
And then there is the weight on my balls too
So if done correctly it is a mild continuous stimulation that is tollerabe but Nicely Stimulating
reminding you of what you can NOT have
PS You may look back and see I tried two rings at once, Which felt really good and made it extremely difficult to tease myself, I could only do my sweet spot, however when I teased myself with just the ring on
it Bit into me and I ended up with a nice bruise and a bit of tearing on the skin, so I DO NOT recomend that.