Ways society can be affected by stds or stis are sexual contact, and the mixing of bodily fluids such as blood, spit (in some stds or stis), sweat (only in some stds or stis), urine, etc.
Self respect can give off an energy to others that you know your worth and everything the people you communicate with will respect you also if u respect yourself. Some ways to show respect to others is to have empathy for them, be kind to them, and help them when they are in need.