See, I've always wondered about that statistic about men being more at risk of being attacked than women walking alone at night. What does it include?
I've been doing a lot of reading about the psychology of violence (there's a great book by Rory Miller called Meditations on Violence, which I can really recommend if you're interested in this kind of stuff) and you can break down incidents into two types: social violence (the male testosterone driven monkey-dance, educational smack downs, etc) and anti-social violence (predator/prey relationship - mugging, rape, random violence with no warning or 'dancing'/'posturing' beforehand).
Predator/Prey is particularly hard to defend yourself in even if you're well-trained, stronger, have a taser/pepper spray/etc because you're already behind the loop. The predator made the decision about the attack long before you knew anything about it, you are already several seconds behind and probably frozen in shock.
The point to this is that most of the violence men will experience is the social violence type. Women are, sadly, more likely to experience the predator/prey situation. Which makes me wonder where that statistic comes from and how it's compiled. Added to that and many more women than men decide not to report their attack.
I don't know for sure, but I'm guessing (in the words of Ben Goldacre) "it's a bit more complicated than that".
Anyway, my martial arts instructor always says that the best defence is not to be there - he gives the same advice to men or women in his class. I tend to follow that. I will walk alone at night, but if there's another option, then I'll take it.