Sexual stimulation wise it does nothing for me. Not that I dislike it. It just doesn't do anything for my arousal level with the exception of some women that look hot as fuck while doing it. Depends how attracted to her face I am for that result, sensory input wise I could care less. It doesnt bother me if a lady does it so long as she is gentle, but if she didn't I wouldn't even notice, even if I was very attracted to her look.