wtf, we don't have detailed history on who was first and who wasn't. a good amount of these diseases are blood borne and transmitted. well the only way to get things by blood is by IV transfusion and IV drugs, both of which have become more sterile over time. When you transmit disease sexually, you are also likely to get your local symptoms.
90% of the population is thought be seropositive for HSV1 (herpes simplex type 1) and a decent amount for HSV2. Traditionally HSV1 is acquired by young kids in school or so -> cold sores. HSV2 is more sexually attributed, but both can be contracted sexually. HSV2 is therefore associated with with the ulcerating painful vesicles of your genitalia , however, because of blowjobs, more and more people have been mixing the two up and you see HSV1 in your pubic area and HSV2 in your labial (lips) area.
so yea, things jump around. wouldn't really worry about it, we know how to tackle most