I can only imagine that's about the same thing the Chinese Taoists were onto. Same description, that is enabling inner absorption of the energy of the seed. Word I read is that high mucky mucks of the day who had sizeable numbers of available concubines would become weak and depleted owing to over-frequent ejaculation (poor babies). But with this method they could save their seed for only the events when the woman was in heat and the pregnancy was desired. And be vigorous enough to pull the whole thing off, kingdom and all.

Sign me up.

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1986 300SDL, 362K
1984 300D, 138K