I'm not a professional writer, so it's nowhere near the same sort of experience, since I don't have to live up to any kind of standards and aren't attempting to become published. That said, I've tried writing erotic short stories on a few occasions because I thought it would be fun, and I have a hell of a time doing it. The first several times, my characters wound up never even getting together -- they'd be thinking all kinds of lusty thoughts about each other, but turning the corner to actually expressing them or touching each other (at all) never quite seemed to happen. (Then again, that's a threshold that I find difficult and mystifying in life as well, despite having been over it a few times.) I did eventually write one story which I think was mildly successful for what it was, but that was after years of "percolation" and I don't know if it would be possible for me to even begin to make it publishable -- it's at least highly implausible. But yeah, a big part of that is that I'm very shy myself, and I find it really difficult to get past that even in a story.