Re: How did STDs originate?
Gee, why don't you ask something easy, like what is the origin of life? lol
I don't know the answer (if there even is one) but if you look at STDs for what they are, viruses or infections (just like non-STD viruses and infections), and look at how viruses move around the globe, jump species, mutate, etc., it doesn't take much to figure out that answering your question isn't going to be possible. It's too complex.