None of my play-throughs of ME or ME2 ever involved any romance, at all. I've not even bothered to roll a maleShep for the sake of romancing a woman none ever see, and I like said woman very, very much.
I have never played a maleShep just for the sake of virtually getting laid with a NPC...
And neither have I. However the fact that Tali is one of the romance options for maleShep was to me, a bit weird and a bit tempting at the same time - Think about it - Quarians can't even spend time with each other without suits because their immune systems can barely handle it when they are synchronized together in a contained environment, so how the hell do they practically romance anyone else?
While I'm not sure on the details atm (don't recall all of it anymore, been a while since I played ME/ME2) it's an interesting question. And Tali is a bad-ass character that puts Krogan to shame - Charging into battle with a shotgun when suit-rupture is more hazardous to you than most other factors? Bad-ass, and a bit suicidal.
So because I like her character, rolling a maleShep to see how the romance option goes is always mildly tempting, also due the fact any romancing adds more variables to the 'what did you do and how did it turn out' part of the game. It hasn't happened yet for a variety of reasons, one of them being, that I agree on Lallara's opinion.