He wants to know if you're "clean"

"...I don't know how else to put this, but..."

Carl seems hesitant to state his concern straight out, and your heart pounds in nervousness at the thought of him rejecting you - refusing to sate your burning desire to be fucked by his thick black cock.

"Well, I can tell you're an... 'experienced' girl, so I wanted to make sure you were, you know...clean."

Your face reddens in embarrassment as you realize he's gotten the impression that you're an experienced slut...to the point he's worried about STDs. Your pussy has yet to even experience a single genuine cock yet, but it can't be helped he'd think you're a slut with how you've been acting and with what you're wearing...

Your pussy heats up with a sudden burst of desire as you realize Carl probably thinks you spend all your free time sucking and fucking thick Mandingo-dicks...the mental image makes you need his cock more than ever.