There are so many cock rings out there. I finally found one I especially like, Doc Johnson's TitanMen stretch-to-fit cock ring. It's a bit of a struggle to get it on. And later, to get it off. But the thick wrap works wonderfully for a very satisfying sustained erection. I suspect that for intercourse it would be a bit in the way and maybe not so comfortable for the partner. For solo work, it performs marvelously! Do post your own faves!