Ozme, that's not exactly the case, no. I just don't "indiscriminately submit."
Assuming somehow that I don't have an actual drive to submit to someone because I don't just throw my submission at anyone's feet (they have to earn it), assumes wrongly that I have to be constantly "conquered."
Though I am definitely not every dominant's type.
"Want to submit" comes later, after the dominant in question has shown me he's worth my submission.
Theoretically, if I was on the market for a dominant, I might agree with you that I may have somehow missed some opportunities, but I'm not looking for them so given that, I tend to not give any indication that I'm easy prey to random people.
And yes you are correct that the vast majority of rapists do go for people they already in some way know, but a large portion of the stranger rapes that do occur, have an "interview" of sorts.
If I met you in a grocery store and you tried to change an item that I was buying I would say: "No, I like what I have, thanks." Because I would find that creepy behavior, even though I probably wouldn't automatically think "zomg he must be a rapist! penis! run away!"
You would walk away assuming I wasn't a submissive or something cause I know what I want at the grocery store and don't like random boobs messing with my shopping cart. And you would be incorrect in your assessment. :P