Where did STDs come from?

Question

Where did STI/STDs come from? Since they are created via giving to someone who has already contracted it

So where did they originate from?

In: Biology

Answer 1

For example HIV predecessor, SIV originated in chimpanzees, so it contracted and mutated to have human hosts either by humans being exposed to their blood (which is likely – for example, by eating them uncooked) or by some twisted form of zoophilia. I wish I was joking.