I had an ex desperately try to get me to do it once but it's really not for me. They ended up getting really pissy at me for a few days about it too... ok it didn't help I laughed while they were trying so hard. We were in a bit of a long distance relationship but I just couldn't find it attractive. I guess it doesn't help that sex noises, even when having sex, do nothing for me (most partners in the past say I'm pretty much silent all the way through XD) and hearing people say cheesy lines like "oh yeah baby I'm " are more than likely to make me laugh than anything else. Oh and if anyone says any variation on "big boy", "daddy" and the like, that's an instant mood killer for me and I will laugh at it uncontrollably.
Text on the other hand over various things like MSN, Skype etc. I do seem to get into and have had more success with when it comes to long distance relationships (incidentally I only ever do this sort of thing with my partners at said time) but I guess that's because I have a vivid imagination, spent a fair amount of my time as a child writing short stories and role playing with friends so it's just the adult extension of that in my mind.
Guess in the end it comes down to whatever floats your boat, different strokes for different folks and all that.