In this scene Wenona is made to put all her fitness to the test. She is an ex fitness and fashion model so they knew she would last out for a while but with the nipple torture they had planned she was always going to lose, how much she would lose would depend on her as her nipples were at risk.
She is tied to a platform by her arms and her ankles are tied together. They cut holes in her top and use test tubes to vacuum her already large nipples even bigger ready for the nipple torture. She is whipped and a vibrator draws an orgasm from her before her feet are caned then the vibrator used for another orgasm before the tit torture begins.
Her ankles are raised and she is stripped before string is attached to each nipple, looped up and over then down to her toes of her raised feet. Her abs are tested as he time she lowers her feet her nipples are pulled. To make it worse the guy is punching her abs then uses a vibrator on her. By the end her nipples are inches from her body. You can see this and other female torture at Hogtied.