Misses the boat entirely.
The case against grunting has less to do with what's going on between the lines. Ever notice that people don't mind male grunters but are easily incensed by female screamers (sorry retro, but here's the reason). We're talking about pitch and resonace, folks. A male grunt is gutteral whereas a female sounds like she's being assaulted; decible count is irrelevant.
I was hoping the physiolocigal considerations would focus on gender.