Look, Manao, It's so simple actually. Like the story is handwaving it but if magic doesn't work right with men its practically guaranteed to be because of the hormones.
Human men and women are super similar to one another, so magic kind of has to work through estrogen. Literally, you wanna use magic so bad. There's a reason it's called being a magical GIRL.
Should have just gone on E, and none of this would have happened lmao