"No" is not code for "try harder"

The following is a real exchange that occurred yesterday between me and a random man(the real coversation was in French, but for your convenience I have translated):

Random man: Hello. You are very beautiful. May I buy you a drink?

Me (angling my body away from him, without a hint of a smile): No, thank you.

Random man(maneuvering his way around so he's even more in my personal space): My friend thinks you are beautiful too. If he kisses you, what will you say?

Me: Absolutely not. I have a boyfriend. I am not interested.

Random man: You are American, no? Is he here?

Me: No, he is in the US.

Random man: Then what is the problem? You are young, you have your whole life ahead of you, why worry about him now? I will buy you a drink.

Me(completely turning my back): No.

Random man continues maneuvering, pulling my arm and chattering in French,  until my friend sees what is going on and saves me by engulfing me in a hug and simultaneously moving  me halfway across the room.

Let's review.  How many times did I use a negative in that conversation? 5.  How many times did the man seem deterred? 0.  Furthermore, after my friend saved me, he proceeded to hit on her!
The sad thing is, this is not something that only happens rarely, with people who just cannot take a hint.  This is something that happens very frequently, to every single woman who is in this city.  There is no eye contact made, no smile given, no hint that there is any interest on the part of the woman, but for some reason the men here think it is their duty to pester every single female that passes within arms' reach.
I am so tired of having my personal space invaded by guys who have obviously not come in contact with soap any time in the past four days, who seem to think that the fact that I am sitting in their vicinity is a giant come-on.

So, I would like to raise a toast to the good old USA, where mothers teach their sons that no=no,  where there are men who are easily deterred by a single word: boyfriend, and where a majority of the population showers on a daily basis!