Some guys who don't stand up for themselves very well actually prefer a woman like that. Also, some guys who do stand up for themselves just fine prefer one too because they like to be able to know that their woman's got their back if need be.
And like somebody else pointed out, not all girls who can fight are the roller derby chick type. Some women who can fight really well don't look all bulked up or walk around with a swagger and a lip full of skoal. Most look like a regular ordinary girl and you only know about what they can do when either they tell you, or you see it happen (or you screw up bigtime and put a hand on them and it happens to you). Of course with girls who do some sort of fighting sport regularly, especially as their primary exercise form, it would be something you would notice right away in a relationship, because it's a big part of their life and they would either want to share it with you or it would be something they would tell you about so you would understand why they devoted so much time to it. You would then know right up front that she could probably kick your ass and you proceed at your own, informed, risk.
On the other hand, you have a girl who doesn't do any sport like that and isn't overly athletic in her hobbies or anything but if push came to shove, it would go immediately to punch, with her fist right up against her opponents jaw. She might look like your average sweet little Junior League, butter wouldn't melt in her mouth, runs from spiders lady. She may even ask you to open tight jars because they are so tight, and with those long perfect nails she has it's no wonder she can't. She's a real sleeper and you would never see it coming because she would never think of bragging about it or even mentioning it, but let somebody start something and she will put an ass whoopin on any man or woman foolish enough to bow up at her. This type usually learned her stuff by being a younger daughter in a large family of boys, or she has had some rougher and wilder past that she never talks about. While she looks, acts and sounds like a princess, she can go from Anglo to Saxon in a trice.
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I'm giving it another shot. We will see.
My forum is still there and everyone is welcome to come join as well. There is a private women only subforum there if anyone is interested. Also, there is no CAPTCHA.

The link to the forum is
http://www.rightplanet.proboards.com