I want to share about my friend... My friend is dating a girl who have
Syphilis, at that time, both of them don't know about her condition. They had sex together on daily basis for maybe one year. They somehow found out that his date is infected with Syphilis. Naturally, my friend got panicked about it and went to see his doctor. Syphilis, by all means, cannot be cured without antibiotic, it is common knowledge. Anyway, once had several tests, to his surprise that he didn't get it from his date. Even though he haven't wear condoms or practice any form of safe sex... His doctor was baffled by that as well. My friend shared with me and I found out why that he isn't infected by his date but I dunno if people around here are ready for this information so I withhold it this time. The point of this real story, if he didn't get it thru sex activities then it must be something else.
What I learned from different studies, I suspect that immune-suppression or low immune system is the fault in these STD issues. That's my opinion based numbers and numbers of studies.