Serious std question, kinda worried

Could I get an std from someone else's cum in my crack? So I let this guy cum on me in my car (it was a lot) and then I masturbated, I felt it leaking down into there and it felt really wet. After we were done I dropped him off and went home. When I went to clean up there was a bunch right there that I wiped off so I'm wondering if there's any risk since it probably didn't go inside me?

By Anonymous