Hi all, just a general question I've been pondering;
If you have unprotected sex with someone who has an STI, what are the chances you will contract that STI? Is it 100% for every STI in existence?
I understand that for the purposes of practicing safe sex, in my mind the answer is 'yes', but in reality is that the truth? If I'm in an environment where a lot of people have a cold, I won't definitely catch a cold, but if I kiss someone with a cold, it's much more likely, is that the principle?
Thanks in advance for any answers!