Teen drama set to music.
Sounds like an excuse to off ourselves if I ever knew of one.
So, on the subject of superpowered STDs, if a large portion of humanity was suddenly able to fling superheated plasma at each other on a whim, 1) we'd probably all burn to death on short notice. 2) Physics dictates that said heat was transferred to said balls of "fire" from somewhere else, and logic dictates that since we are the source of it, the energy probably came from the food we ate. So once a large portion of the U.S. population was infected, we'd essentially become the biggest walking flamethrowers in the world given all the lovely carbs floating around. Hence, the inequalities of the rich and the poor would increase vastly, because the biggest, fattest dudes can fling more fireballs more often, probably with slightly less impact to themselves, while the starving would only die sooner as they wasted the last of their calories to burn the fatties.
I think a far more amusing and
slightly less apocalyptic superpower to acquire via STD would be the ability to recover from grievous injuries, even fatal head injuries, with no permanent effects. It'd still have the potential to kill everyone but the first bunch of psychopaths to decide they're going to fuck each other blind and become invincible and then kill everyone else, but at least they'd still have to come up with ways by which to kill us besides their latent capacity to fling fire wherever.