Ooh, one of the few times I've seen the strength difference being addressed like this. I've heard of people having trouble with that sometimes, when the girl finally realized that EVERY man has been going easy on them, strength wise. Some getting traumatized by that realization.
Note, this has nothing to do with abuse, just like play wrestling etc.
EDIT: And also not to say that strong women don't exist, just that on average you'd expect roughly one in a thousand adult women to be as strong as an average man.