environment of fear

Last class the group that was researching rape was presenting. It was very interesting to me to hear how the girls in the class felt scared when they walked next to a guy at night. The reason it was interesting was because they said that the guy's need to stop acting weird. When asked how that was possible non of them had an answer. This was the most frightening part because as a male I don't try to act creepy but just from me being male I am subject to that definition because of the environment of fear that women have when walking at night. So I ask again what would be the best way not to be creepy because I am not trying to frighten anyone.