Well, if you don't have a taser, mace, a weapon or some serious kung fu.... urinating or defecating on yourself might work. Kind of like the hardcore survivalist way of looking at self defense.
Gun certainly aren't THE answer. They certainly are AN answer. Damned effective one, too.
"Tell men not to rape" is... and interesting line of defense.
Y'know, I've often thought that we need to deconstruct the oft spouted "If guns made people safe this should be the safest country in the world" spliff.
No, guns IN THE HANDS of good people is pretty much the only surefire deterrent crime. The problem is that we have too many guns or that we need more guns, its that we need to have to ability to carry them so that we have them when the crimes occur. Those 20 guns in the safe don't make a bit of difference...