No ejaculate post RALP

I remembered long long time ago in the 1960s... 70s that when a male gets excited & then doesn't climax, he gets something called "blue balls". Maybe this a myth or some truth to it that there will be trouble if that happens often. Logically & normally the sperms are supposed to leave the body but this build up of sperms, is it a concern especially I am reading many men masturbate a few times a week.