My wife when she was younger (over 18) and at a boyfriend's place.
She was going to use that bottle of oil and the vibrator to prepare herself for his large size.
He told me that it was not uncommon for him to invite some of his buddies over when Cheryl was going to be there. Apparently he had the right combination of "stuff" to get her into the right state of mind for lots of fucking. She'd take everything the guys could give her during that night.