Originally Posted by YouAreHere
Depending on the context, there may not be a valid pairing (as in my "Girls' Night Out" emails from my friends). I agree that using mismatched word (other than for effect, maybe) would be jarring, but I don't think that's what we're talking about here.
Then I believe you are mistaken.~
This is all relevant to why "gals" is not as commonly used as it used to be as "guys" was and is.~
Why exactly is "girls" more popular than "guys" like "girls night out"?~
Sure some people use the term "boys night out", but they also use the term "guys night out": how is this more popular than "gals night out"?~