[QUOTE=Scylla]
Probably not like that. But I’ll bet you do a quick automatic assessment without thinking about it. The only time you probably think about it is when that “threat detector” goes off.
I’m a man. I don’t have that. My daughter is 8, she doesn’t have it.
[/quote]
Note that in the following post I may sound like a bastard, but I actually mean these in the friendliest way possible:
If you don’t have a threat detector you have a pretty good approximation of one, considering your (reasonable) fear going through a bad neighborhood with a wad of cash in your pocket. It will feel pretty much the same way, you don’t need to treat everyone with suspicion because to anyone with three functioning braincells suspicion should be patently obvious except in the most practiced <insert random form of abduction or abuse here>ers. Sure, you should make sure your daughter is safe, but you seem to have an incredibly arbitrary set of rules. If I don’t look for you it’s because I don’t particularly NEED you for the interaction. I’ll look for you when your kid starts crying or needs a band-aid, if she steals my baby cousin’s[sup]1[/sup] toy, that’s between my cousin and her, I’m there to act as a mediator to mitigate biting and poopy head comments and you can feel free to jump in if needed, your consent is not needed for me to make my child politely ask for his toy back. If I want to take your kid for a walk of course I’ll ask, and you’re damn RIGHT to be suspicious if someone randomly takes your daughter into the woods, but you don’t need to be a hawk to see that, and as a failsafe your daughter probably knows to say “no way!” anyway. It’s not like you need to be ready to suddenly spring into action, the chances of a pedophile grabbing your daughter forcefully, running, and not getting stopped by anyone are ferociously less likely than a subtle yet detectable method of getting taken, which you obviously have the skills to detect.
In short, you don’t need to “send signals” to mediate every interaction, you just need to know how to read the signals if and when something comes up, because the volume of harmless people is so large the chances of every single one following your “rules” are slim. It would be much easier and much less stressful to sit back wait for someone to try and do something, than to have a set of rather arbitrary “checkpoints” with all this “he sends a signal that says” stuff. Because pretty much anything that will immediately hurt your daughter will probably be able to immediately hurt you too, or will be too fast for you to prevent, and no amount of signal reading is going to prevent those from happening. In other words, anyone with a strict intention to punch, fondle, or shoot your daughter will do so and you’re not going to head it off, and I think we can both agree the guy who does it will be beaten by about a thousand furious parents reducing the chances of it happening. Anyone trying to lead your daughter into their van can be head off before they do it, and I trust you’ll be able to detect something that obvious. 
Also, about the rape talk. It may be good to at least tell her “if someone wants you to play with their private parts tell them no and come see me” if you don’t want to make her afraid or go into detail. It would at least give her a course of action when she is caught alone. Think of all the free time you’ll have when you can enjoy yourself at the park and know your daughter can tell the strangers to shove it! 
(I have a feeling I said SOMETHING very stupid or offensive in there and I apologize preemptively.)
slight hijack
Have times really changed or were my parents just way underprotective? As long as I told my mom or dad I was leaving I could pretty much go anywhere in the neighborhood, including the woods behind my friend’s house as long as I was with a friend (in fact all my friends had this rule including, my 3 year old older than me male friend, my two male friends in my grade, my two female friends in my grade, and my teenage female babysitter who lived down the hill from me, not that the latter accompaniment came up often, as I was like, 5), and I could even go unaccompanied to my friends house four streets down as long as I went straight there. Because they uh, trusted my own judgment and trusted my friends to know where and how to get help if I got hurt. Pretty much the only time I was watched was a casual glance when I was in my backyard if they happened to be passing by the window and when I was in an unfamiliar place (more for fear of me getting lost than anything). As far as I can tell, I’m not dead yet. So what, was I just way underwatched or was that normal 10-15 years ago?
unhijack
[sup]1. Yeah I don’t have kids, but my little cousin, around the same age as your child is just as dear to me and I’ve been granted the title of surrogate adult guardian if her mom’s not there.[/sup]