Cock rings & erections?

[cakalacman]

I was just wondering if any of you guys had used the cock rings and which ones worked? Cause, I have a problem with after I come, I lose my erection. Most guys tell me that after ejaculation they are ready to go. I can last a while but sometimes I like to go ahead and get mine so I can get rought with my girl, cause if I try to go real fast before I get off, well I get off. I don't think I am the only one with this problem. Help please!!!!!