On saturday I made a stupid mistake long story short, how worried should i be. I used the same hand to massage the outer and inner labia of a girl. I did not enter her. After that I used the same hand to masturbate with also rubbing the base of my penis on her open lips. The head did not enter her and it was light rubbing. My major concern is std from her mouth to base of penis, and external vaginal fluid and minutes after masturbating with the same hand.