I used to really be into dirty talk, but with my current gf, not so much. Every now and then it slips in there, but not so much anymore.

If it's loud enough that other people can hear it, it's too loud.

I like hearing noise and sounds during sex. However, we have to keep it down sometimes so our kids can't hear on the other side of the house. If they can hear, it's too loud.

I'm of the opinion you can NEVER be too loud! I'm a VERY loud person, and I love hearing others vocalize. I admit, however, I do worry sometimes that I get too loud, but I love being able to voice my pleasure.

The only exception is when others are around: as others said, if other people can hear it, it's probably too loud.

I prefer my partner to do whatever comes natural to him. I tend to be a bit on the loud side when possible, but when we're within earshot of others I can keep it down pretty well. (At least I think I do. LOL)

I prefer slightly too loud to no noise at all.

I'm pretty loud, but as other have said, if you're disrupting other people, then it's too loud. I've also found that I get extra turned on when forced to keep quiet, I guess because it's in my nature to be vocal.