That makes sense. After all, she has a much larger figure in one area than the men do. Of course, she has counterparts to a few of them. But the question is raised as to why she can't equip sol spear and Matt can't equip thunder spear. They're both spears, for Godcat's sake!
The Beholder's attack in the fourth game leads to this quote:
—Natz: Eww. I hope I don't get pregnant from this again.
Eh. It's possible that again in this context just means that she hopes, yet again, that she doesn't get pregnant. Just like she hoped she didn't last time. The less savory implication is possible, but it's not definite.