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If "Master/Slave" terminology in computing sounds bad now, why not change it to "Dom/Sub"?
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
This is a myth, presumably meant to be reassuring to subs that are new to BDSM, at the expense of risk awareness. In principle the sub is no more "in control" than the dom is, and in practice they are often significantly less so.