Someone being able to give a blowjob doesn't mean they're not a virgin. I knew a few girls was back in high school who were know for giving head but being untouched below the waist. Obviously, I wouldn't call such girls "innocent" or "pure" or anything, but they can still be virgins.
Also, there's this little part that you seem to be forgetting:
And the very next line she speaks is, "Every copy is a virgin." She
could be lying, but there's no reason for her to do so really at this point. She's already got the customer, she's begging for his dick, and she says he can call her a slut while getting what he's paid for. Seems pretty clear she absolutely
is a virgin. Her experience probably comes from her clones getting banged. They disappear, but she still remembers how the sex worked and gains knowledge from each experience. She herself remains a virgin physically... just maybe not mentally or emotionally.