Vaccinations for STD's make me happy to a silly extreme. It makes me feel like... we're winning.
All of History: Sex is bad, m'kay?
The 70's: Hey, wait... maybe sex is actually... GOOD! (Proceeds to go crazy with it.)
The 80's: D'oh, STD's. I guess sex is bad after all.
Modern vaccinations: Sex is good again, and we did it with SCIENCE. Take that, God.