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This is just a cultural quirk and a perception that has developed over centuries. There is nothing inherently dirty, funny, or disrespectful in the words themselves. As far as I remember, they were originally taboo, in part out of respect for the organs and the process, similar to how one wouldn't name a bear unnecessarily or refer to God in the Bible. This shift happened in modern language. We need to see what will happen in a thousand years; maybe it will become the norm and be used in all official documents. And people, like in Huxley's book, will faint and cover their ears at the words "mother" and "father" or some other nonsense that seems normal to us now. Or everything will remain as it is; who knows. In general, I see taboo expressive vocabulary as too important an element of communication to degenerate and disappear completely, but the composition of taboo words can change, and this is happening now, take the same swear words. Language changes, attitudes towards words change, and in my opinion, there is no point in clinging to some fleeting cultural aspects. If you don't like it, it's unpleasant to hear – okay, I can understand; I don't like it when people use too much profanity, everything is good in moderation. But this is definitely not something terrible that should not exist, but a full-fledged working part of the language that has been, is, and will be.