::::::::::::::::::::Sorry, but just because you think only pre-pubescent children don't know what it looks like that doesn't make it true. There are women who don't have sex until they're in their twenties or thirties, and some never have sex at all, be it because they're not interested in it or because they can't find a partner. This group isn't "hypothetical", nor are they pre-pubescent. And even if you're sexually active, as a woman you don't necessarily see the ejaculation as it may happen "inside".