I think it depends on your definition of "romantic" and other factors, such as personality types, venue, and where the specific "romantic" element is positioned on the classic sine wave of the evening's total love-making cycle.
I'll give tubes a definite advantage during dinner and foreplay. After that, there are simply too many varibles to reach a solid conclusion, IMHO. I'd use the common "thumbs up" term here for vaccum tubes but there are, most likely, other things that are "up" during this segment besides just thumbs.
The age and energy levels of participants could swing the pendulum one way or the other. Also, whether one is an analytical chess player, or a "score right now" hockey player could be factors.. As for intensity, I can't explain why but the terms "slew rate" and "dampening factor" pop into my head, giving solid state the advantage. And, yes, the venue. An AirBNB is quite different than tent camping (both of which have zero chance of having a vacuum tube amplifier near by), so a solid state (most likely a Bluetooth speaker) will be the winner by default.
In summary, I tend to be neutral on the tubes vs SS debate, and I'm sure either can rise to the occassion when called upon.