I don't find it that much of a leap to think that she might enjoy the whole shower thing. She's already curious about emotions and about humans. She's been living there for three years, and the shower appeared in a dream. It isn't like she was sitting there thinking logically about what would be an appropriate sensual experience for a Vulcan. It was something that got worked into her subconscious, regardless of what it could mean through dream analysis. We all could dream about something that we have no experience with, nor would normally want to experience... It's a dream. I actually find that a lot of what HR found is what I originally interpreted from that dream. And yes it has been brought up before that maybe she's drawing on experience too. Now if I retcon things a bit one could also argue that her connection to Trip may have been coming into play. It isn't known how long they were having "day dreams" and an argument could be made that they just didn't realize what those dreams were. Maybe some of what she was bringing into that dream wasn't from her mind... The other thing is that B&B were going for a bit of shock value with that scene. It's supposed to sort of come out of no where within the context of the episode. Yes, it does illustrate something, but I think it was also something that was supposed to make one sit up and take notice as it being a little "off" regardless of the pairing. Would something else have accomplished the same thing... possibly, but I was OK with what was there, warts and all.