To be perfectly blunt about this - I have a pair of briefs with a hole for the cock to stick out, this by way of trim has a built-in cock-ring. Now, when erect it seems rather on the tight side and causes blood vessels to look like they're under a bit of pressure (anyone remember the cartoon "Stressed Eric"?).
I know cock-rings are supposed to have this sort of effect on one's bits but it does concern me a bit that, if too tight, could damage something and I really don't want to suffer damage down there, or have to explain to someone in A+E exactly why my knob has exploded.
So - is this a dangerous level of constriction or am I just worrying needlessly?