There are lies, damned lies, and statistics!
The problem here is that sexual assault as a category is underreported, Both male and female.
And extremely difficult to prove.
Women are unlikely to be believed (#metoo) but so are men. The societal view is that men cannot be sexually assaulted against their will because they are taller, stronger, etc etc and it is this latter assumption which the OP is trying to challenge.
A small woman can do a lot of damage, with sharp objects, etc there is nothing stopping her from throwing herself into a man and bear in mind that even if a man COULD use force he might not want to, for fear of hurting her.