I need to learn what?

You make it sound like the words have something wrong with their chromosomes -- two, or even three, X (aka 女) chormosomes and it is still a male!

More along the lines of I associate words with a "女" as related to females or to (stereotypical) female traits. 女孩子 and 孫女 come to mind, of course, and to me "女婿" felt similar to those.

女婿 son-in-law

上门女婿 a man who is married into his wife's family

 

It seems by tradition the woman marries into the man's family, however 上门女婿 is when the man marries into the woman's family and often moves to where her family is based.

Interesting, didn't know this!