How do STDs work exactly?

Question

So we are always taught that STDs come from sexual contact with a person that has been infected.

But how does the infected person get infected in the first place?

There has to be a primary way where someone get infected (not through sex) and then transmits that to others through sex right?

I would imagine that bec we do have treatments for STDs they would go extinct if the only way of getting and STD was through sex. But that isn’t the case.

In: Biology

Answer 1

I know noone answered your question well, because I too looked for the same answer years ago. There’s almost nothing on their origin. The best I could find when I went digging was some are found in dirt. The ground. And if the right conditions are met, a toilet seat is viable (not for all), I don’t care who tells you otherwise.