"People Used To Bind Dicks With Latex During Sex!"
Need to brighten up your day? Look into the disgusting ways our ancestors prevented pregnancy and be thankful that we have hygienic, convenient Trojans. People used to stuff themselves with crocodile dung! They wrapped themselves in animal guts! Crazy, right? But when you really think about it, the weird part wasn't that the substances were yucky; the weird part is the whole barrier method of contraception, period. Specifically, the fact that it's still the best we can do.
Imagine a future in which -- bear with me, I'm going somewhere with this -- semen no longer contains sperm. Not all the time, just when we don't want it to. We're pretty close to this already. There are injections and pills that can halt sperm production but let every other part of sex go on as normal, and though they're stuck in the research stage until we iron out the side effects, we'll eventually reach the point where someone can ejaculate anywhere they want with zero risk of pregnancy.
You're no doubt wondering about STDs, perhaps speculating that this is secretly a sponsored post from a company that manufactures crotch ailments. Well, call me an optimist, but STDs could get eradicated altogether, depending on public policy. Of course, they could also get a lot worse, but either way, we don't try to stop flu outbreaks by making everyone wear Hazmat suits when they leave the house.