Yeah that whole, "hot and relatively brown-colored" was quite the open ended phrase. As with others, my first thought was about Padma.
Then, of course my mind wandered to the idea that Marten may be into some REALLY nasty stuff in bed (which Dora didn't tell everyone and she covered it up saying he was vanilla).
Then the next obvious thought was that maybe he liked women with light skin but didn't bother to clean themselves well enough, so they were relatively brown in certain areas.
Then my thoughts went towards the more innocent route, I'm sure she was talking about kittens and bunnies with brown fur color which he likes to have as pets and cuddle with them for warmth.
Then I thought, nahhhh, Marten's a dog person. I could see him in his single, lonely days (pre-QC timeframe) letting a dog sleep in bed with him, with brown fur of course and Marten as the front spoon.
Then I realized Faye was talking about coffee. Yeah duh, coffee.