How much is it likely, that a prostitute would offer you sex on the street and it wouldn't be some sort of scam?

>Walking down the city square with my friend two hours ago
>Having a conversation about how do we get home
>Suddenly a girl starts to aproach us
>She kinda looks like >pic related but has more makeup and it's not actually her
>Asks us: "Hey, guys, would you like to have sex?
>We two are introverts. My friend isn't so autistic as me thoough.
>He asks: A what?
>"Sex", she says.
>Noideawhatshouldisay.3gp
>My friend asks if this is being recorded, thinking it is a prank.
>She says no.
>Friend tells her politely that he has no interest
>We then went home.

This never happened to me before. It would be also my first time I ever had sex, if I agreed. Really don't know how to feel about this and what should I say if I will have that much luck next time.