As long as you're getting paid for the time, I wouldn't worry about it. It's entirely possible that the guy/s just don't like to talk; I've had a few Excl on SM where the guy didn't say one word, so on my end, that's my cue to do an awesome sexy show with a bit of dirty talk. Something fun, with awesome camera angles, and a bit of everything sprinkled in (different toys, positions, etc.) But definitely don't just sit there doing nothing unless they specifically ask you to, you don't want to get bad ratings for being 'boring'! Just have a good time, get yourself off, and he'll most likely do the same.