Guys can get off from penetration so much easier than girls can.

My first sexual partner (who had been with others before me) didn’t like oral at all, or any clitoral stimulation, really. Her clit was extremely sensitive to the point that she said direct stimulation was basically painful, and she wasn’t sure she had ever had an orgasm. We worked on it for a few months and…

You’re absolutely right that (good) sexual partners of any gender should be willing (and wanting!) to perform normal, healthy sexual acts to help each other achieve orgasm.

This isn’t a rule. Some women get off easier from penetration. Some men get off easier from oral sex. People are different.