I suspect that is a large part of the reason behind why it is said - it clearly separates the overlapping Venn diagram conflating 'rape' and 'sex' which has caused and continues to cause great problems in dealing with the issue. I wanted to limit my question to how much evidence we have that it is true that it is always 'about power', though. What the 'about' bit means is obv important in picking that apart.
This just seems to be saying that it is a violation and an abuse of power, which I have no argument with. Your paragraph previous to this suggests that there is more going on when we say 'rape is about power', though, and that we are positing motive or reasoning or at least saying something about the meaning of the act that goes beyond this prosaic explanation.
For example, murder is an abuse of power but we don't say 'murder is about power'. We accept that the reasons for it can include a massive gamut of things from revenge to money right through to wanting to impress Jodie Foster, and we accept that a messy bundle of reasons and motives do not somehow make the act defensible.
I'm not aware of the sitcom you mention - it sounds quite charming and I did think you were talking about some execrable 70s shite until the end of the sentence.