During clymax, the body does a number of different things. Chemicals release to the brain, muscles contract, heart rate increases.. etc. All of these things still happen with or without ejaculation. For most men ejaculation signals the end to their sexual encounter...
In ancient China the Taoists taught that men should retain their Yang energy, which manifested as semen, from the greedy women and their Yin energy. If a man could have sex, and stave off ejaculation he could become immortal. There were many texts written on how a man could have sex and not cum. I don't think this would have been very popular if men didn't get some sort of release out of it.
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