I had unprotected sex with 2 different partners within 5 days, will I?
It's necessary for you to turn to the internet and look up the CDC and Planned Parenthood and NIH description of STDs. Communicable disease are passed from person to person. Your coworker has a cold. Your coworker snivels on you. You have a cold. STDs exist because people of the past didn't bother asking this question at all. They would get sick or get sores and keep on having sex. They would not get treatments because they were trying to keep it secret. If your partners were healthy, you can't catch an STD. If they weren't, you might. Having unprotected sex with two different partners in a week is my normal week. One time my partner got a cold sore from a friend by kissing. I would not kiss him until he wasn't breaking out anymore. Three years and just a cold sore. I get tested every year for diseases I know I don't have. Better I don't spread anything worse than a cold sore.