You don't get STDs from sleeping with random people. You get it from 1 person who has it. And they could get it from 1 person.
Why do people attach morality to a disease or infection?
yes and if you didnt sleep with that person you would not have got it would you. i sleep with people who are clean and checked out. me and my wife did not sleep with each other for i think half a year after first meeting. we both knew we were clean before sleeping together also.
have either of us ever had an STD? no ofcourse not, because we dont go around sleeping with people who are not checked out and clean.
peace.