Good, it's not that hard to understand. I'm surprised it took this long.
You probably realize that my sarcasm was a strong indication of my opinion that you are overprotective and paranoid, and overall a pretty bad parent. But just in case you're oblivious, let me say it: you are overprotective and paranoid, and it's likely that your daughter will rebel against you, leading her to get into troublesome and riskier situations than she would have had had you let her breathe a bit more.
Because the two are related

. Are you being serious or not?
Why wouldn't they be? Are you saying that woman-on-man rape is not a serious issue?
You said it was with a group of your brothers friends, not alone. Are you having trouble seeing the HUGE difference?
Nope, I didn't say it was with a "group" of friends (not that it'd make a difference, after all, that just makes gang rape easier). I said "friends" in plural because my brother had more than one friend, but it frequently happened that just one friend was present at the time, in our house, with no one else but me around. So I was frequently alone with one of his friends at various periods of time. Nothing ever happened beyond him just hanging around, chatting or making jokes while waiting for my brother, or him or us playing video games or watching TV in the most normal, platonic way you can imagine.
Statistically, I'm sure that many rapes occur with this sort of scenario; older brother's friend is alone with the teenaged sister and takes advantage of her, then frightens her into silence. On the other hand, it's statistically the case that most teenage girls who happen to be around their older brother's friend(s) or older neighbours or whatever, have nothing happen to them.
You're basically saying two things here: a) that it's near-impossible for an older guy to want to interact with a teenage girl in a non-sexual way; and b) that your teenage daughter should be watched at all times, just in case she might encounter a rapist.
a) is frankly wrong and creepy, and sounds like pure projection to me. Most people in this thread so far agree.
b) is paranoid misandry, and is counter-productive. Sure, it might prevent rape... it might also alienate your daughter to the point of causing her unhappiness. But that's okay, since the tiny risk of rape is now reduced to 0!
"I engaged in a high risk activity and I'm fine so everyone else should be too"
High-risk activity...

I'm so glad that I am not so bitter as to treat every older boy as a potential rapist.
I think I finally see what the problem is. People like yourself, because it's not all that common, think because you beat the odds
"Beat the odds"? When you say someone beat the odds, you're saying that it was more likely for them to fail than to succeed. So you're saying that it was MORE likely for me to be raped than NOT raped. Wow.
You're contributing to the problem.
You're right. I am contributing to the endemic rapes that occur in society. How shall I ever sleep at night.
By the way, I actually find it somewhat insulting that you think I was being naive by trusting those guys. I mean, do you think that just because I was 15, I had no judgment whatsoever? My parents raised me right, and I definitely knew if someone was suspicious to hang out with or not.
I think you're sexist, but now I'm not sure if you're sexist against men ("most men are lecherous creeps and potential rapists, and no girl should ever be left alone with any of them"), or women ("girls are naive and must constantly be protected from their own stupidity").
At what point do you begin to realize this older man isn't hanging out with this girl because he finds her interesting. He's hanging out with her because he wants sex.
At what point do you realize that you're projecting? Just curious.