The cause of sexually transmitted disease is almost exclusively sexual acts. Therefore, if those acts were banned, stigmatized, or simply avoided for a single generation, STD’s would be nearly wiped out. The few cases of STD’s being transferred through drug use or other means wouldn’t keep up enough to make a difference.
But try and present this as a possible solution and you’ll be condemned as an unloving, bigoted, hate-mongering sociopath. “Love is love”, man, or something. For the Left, and increasingly their decade-old clones that are called conservatives, the obvious solution to the problem of sexually-transmitted diseases is unacceptable.
Some of this is tied to the secular humanist notion that we are simply material animals and our instincts and desires serve no higher authority. An even larger part is a misuse of the term “love” to mean “pleasure”. If anyone infected with an STD loved their sexual partners, those partners wouldn’t be sexual.
The great irony in this age of “love is love” is how little love there really is. There’s selfish desire for pleasure in abundance. Just a single generation of men and women who really understood love would result in the extinction of STD’s. We have no such generation. If anything, we’re farther from that sort of thing than we’ve been in centuries.