I've done OWO numerous times with different women,just had my latest check up and all negative just like all the previous times.I know it can be risky,especially for gonorrhea and clamydia,but life is risky generally and you have to have your little pleasures.Rarely do RO though,it just doesn't do it for me,and makes my tongue muscles hurt the next day.
Main thing you can do to protect yourself is to get vaccinated for Hep B.