I've noticed this too. I also can't imagine that a cock ring would do any harm, but I think it's a combination of what your heart and brain are trying to do at the same time. After all you need the blood flow to maintain an erection, but if your heart is pumping like crazy and your brain is throbbing, presumably the body is redirecting some of that blood from the bit you want most.
I found that using poppers for things like sucking, rimming and kissing is great. But I don't use too much when fucking, because it does affect the effect. I'd say it's trial and error - work out which activities you get the most from using poppers and cut down on the stuff you need to be rock hard for. And try the cock ring. Let us know how it goes!
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