Sup guys, yet another one of us here... I'm 17.
Anyway, here's my take on things.
About having guys you know cockblock you or stuff, just ignore them. I mean when you k-close in front of other ppl, you're always gonna get someone making fun of you or whatever, they're just jealous, so I usually just flip the bird at them and smile.
If you're not present, you do the same thing, pretty much. Just laugh it off and say something like "haha lol he said that? So typical for him

"
About sarging the friends of someone you've closed...
I think this depends on the girl you closed. If she's... open-minded and all for having fun, she probably won't give two shits, and if she doesn't, the chance that someone else will is significantly lower. IF however, she's like pretty much every underage girl around, she will care, and she will start shittalking you. So, my advice would be to befriend her friends, but DO NOT go the extra mile and k-close them.
I have done it, and it did not work out good lol, kind of blew me out of that circle after a while.
Now, about sarging when our age. I dno what the hell you're saying about partys being a rare occasion, maybe they are where you live, but I party almost every weekend, and most weekends both friday and saturday. But I suppose we're a bit f-ed up in my hometown =) I don't sarge in school, only at the beginning of the term when I don't know all the new ppl. (The scool system in Sweden is different..)
9 years mandatory school (similar to high school) -> 3 years optional school (college) -> 2-8 years optional school (uni)
Hm what else... When I'm travelling somewhere I always sarge as much as possible, I mean you gotta take every opportunity possible, and try not to give a shit about the outcome. If something feels right, it probably is. That's my take on some of the things mentioned here.
- Trices