Why do Guys make loud Grunts while working out at the gym?

Every time I go to the gym, I always hear a few guys Grunt really loud while lifting weights. It catches me off guard & scares me a bit lol. My guess is that they use grunting to help them through the last few reps they have lol or their hurting. Usually these guys are the real macho type with Huge muscles, not saying this has anything do with it but it just happens to be this type of guy.

Also, I wonder what guys would do if girls grunted out loud while lifting weights, would this be social acceptable hahaha! :p

Why do guys grunt really loud when working out? Also, guys how would you feel if a girl grunted while lifting weights? lol
Why do Guys make loud Grunts while working out at the gym?
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