You don't need to know why- just do them. There is no reason!! Ok, that was a lame joke!
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Yes, they are indeed very important. If you kegel, you must reverse kegel as well. Not only because of the befenifts we get from the RKs when we stretch (if you need further clarification- don't be afraid t ask), but because you must balance the Pelvic Floor muscles. Here is a thread that can definitely help you understand the purpose of RKs and their importance (
http://www.mattersofsize.com/forum/...re-ejaculation-and-overall-penile-health.html ). Enjoy!