But it's your life and your body... if you'd rather be more careful than the way I approach it, please do.

As far as you want to take the protocol for STI testing... but in most cases of casual sex, asking them to take an STI test will take the "casual" out of it, for sure. However, at least with me. I observe the area, make sure they don't have a real crazy, loose past, and wear a condom. And ...