How do 18 year olds not know how the internet works? They are perfectly aware that if they are filmed and it's uploaded, other people will see it and it can't be erased.
They're old enough to get married and buy a house. They're way past the age of consent. They are contacting her, going to her to have sex. They're fully aware of what sex is.
She's not grooming people or manipulating them. They're not being paid. She's not going to halls and leaving a trail of sweets.
These are young adult men, intelligent enough to go to university. If they choose to queue up and have sex with a sex worker, that's their rather grim decision.