My parents have probably never talked to me about sex, yet me and my friends talk have talk about sex all the time, although plenty of times it's under the context of jokes, sometimes it isn't.
Like me, I actually told the girl(for some reason, there's a hot girl that always hangs around us 3 or 4 guys) that she should give someone a blowjob. Everyone burst out laughing.
Sex is an act of nature. Evolution basically made it so that sex would feel better, as so to catalyze reproduction. You can't really stop it from happening, it exists, everyone knows it exist, it's pointless to hide it.
Look one funny family guy clip: "British porn."