Hasn't the consenting adult also been manipulated by a CES advertising booth into buying the sex item..? And why is it bad to use sex to manipulate a customer

Hasn't the consenting adult also been manipulated by a CES advertising booth into buying the sex item..? And why is it bad to use sex to manipulate a customer into buying an item, but it is good to use free samples or pretty pictures to manipulate a customer into buying the same item? Deriving cultural moral values from first principles is hairy :/