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.