I prefer being blindfolded until the game starts. It's not a strong preference exactly. I could almost lean towards either way according to my whims, but in practice I've learned that I simply shouldn't make that accurate or far reaching conclusions from a pre-playing information. it's not just deceptive trailers, glib marketing, incompetent reviewers or rabid fans but also a word to mouth info from my friends can be pretty unreliable in determining something that is so specific, context related and personal. I can hardly guess beforehand whether I will enjoy a game enough to finish it*, let alone predict which romance will be the most interesting or best suited to my current playthrough (or which imaginary alien will be the most hottest, as it sometimes comes down to). For me, at the best hearing about romance choices beforehand would be pretty indifferent, as I'd deem it too unreliable to affect my decisions. At the worst it might be distracting, or misleading and potentially spoiling, so I'd rather not hear about anything.
So, just like in real life; I say yes to surprise romances.
My first playthrough is always with a minimal information, and while playing my maxim tends to be something like let the chips fall where they may. My following playthroughs are different however. Then I almost always plan heavily beforehand what kind of a narrative I want.
*Not long ago, I actually tried to quantify and compare of how my preconceptions about games actually matched my final opinion. Not too surprisingly, a coin toss nearly had a predictive value equal to my pre-playing surmises, and that was almost totally regardless of sources from which I had gained those impressions. The particular highlight was shunning Planescape Torment for years, which is atm one of my all-time favorite CRPGs, because of artsy trailers and my initial dislike of the Planescape setting.