I don't know what "power dynamic" means, but feel free to provide a clear definition for it. If you've actually got some set of abstract principles you are willing to use across the board, I'd love to hear them.
From my vantage point, I don't see much of a problem here. Offering investment is a beneficial act. So is offering romantic or sexual options. It's hard to see why offering both together suddenly becomes a bad thing - worst case the recipient can decline and is exactly as well off as before.
I'm not sure where to start with this. Is it the idea that you find the act of a stranger putting their hand on a bodily location that would trip the statutes in several US states governing sexual assault "an offer of romantic or sexual options"? The idea that such an "offer" of "options", were we to stipulate that there was any optionality involved, would have been benign? Your statement that the "worst case" is the recipient declines and is "exactly" as well off as before?
But then I reread your second graph, where you cordially invite me to litigate the meaning of the term "power dynamic", and I realize you're just going to draw me into a fake debate where you play the nerd trump card of discrediting a straw man notion of social science instead of engaging the actual issue. And it's not like I'd lose that argument, just that it would be an enervating experience for both of us.