I love the fact that in a 600+ page thread, there's not one person who has first hand experience with telling Dorian to take it slowly in the romance! 
We are all just too thirsty for that moustache to delay it any longer!
I picked it! I just haven't finished the game yet so I don't know where it leads.
I chose "taking it slowly" because I figured it was similar to the "sex OR a loving relationship" dichotomy that they did with Zevran, and I definitely wanted to check out the latter. There's a really sweet line where Dorian says he's confused because relationships between men in Tevinter are mostly about pleasure, and he has no role models of actual romantic partnerships to use as an example. The Inquisitor can say they can be the example 
Also because (IMO) Dorian was coming on a bit too strong by breathing in the Inquisitor's ear after like two romance conversations 
But I can see why almost everyone would pick the top right sexytimes option, because it's the one with the heart symbol. The game doesn't go out of its way to make clear what happens if you ask to take it slowly, but I did get the achievement for locking in a romance and Dorian still acts like we're together.
So... that's why I was wondering where it ends up, is the intimate scene just... later?