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I have stopped doing kegels since I experience the same as some of you guys: comming quicker. In my case, I could go for 30 minutes to an hour. After starting to kegel I need to stop thrusting after a few minutes 2-5 in order not to come.
Therefore, for me kegels are out
The problem is when you do kegel, you have a stronger muscle. Stronger muscle equals stronger contractions, so see this like a pump. A stronger pump will have a liquid (sperm) comes faster.
Now the purpose of kegels are not faster pumping of sperm, but for stopping orgasm. Rest of the time, you should relax your muscle during masturbation or intercourse.