OK so the only reason I did not give 5 stars is because my guy is massive (10 in and THICK) and I'm petite, so it wasn't as amazing as everyone elses experience so far, but I have some tips & think I know what our problems were. I'll try to go into specifics of our experience so hopefully it will help others! We got these hoping he wouldn't have to be so careful and wouldn't be able to go too deep or hit my cervix. My guy said they were comfortable but a little tight like a condom, although we were still hitting cervix after 4 rings so I think we need a second set to add more rings just because he's sooo big. Shouldn't be an issue with most users, and definitely still was helpful for us. He said it helped and made it better/easier to control depth. Just note they only come in one size. I went to the OHNUT website and they recommended if they were fitting too tight, to store them on a bottle that is 3inches in diameter for a few hours before use to temporarily stretch them - we will be trying this next time to see if it helps. (they rubbed too tight on him and left some raw skin last time, so the stretch method should help us avoid that) I also think we should have used more lube on him before applying the rings, which might have been what caused the chafing. MAKE SURE YOU USE ENOUGH LUBE AND STRETCH THEM OUT ON A BOTTLE BEFORE USE IF YOUR GUY IS XXL! Hope this helps!