The fourth installment investigates the lingerie fashionable adult women wear beneath their street outfits. Interviews move from fashion and measurements to increasingly intimate questions about sensitive spots and sex toys. Though initially confused, the women agree to become adult-toy testers after negotiating a fee. Suppressed moans gradually escape as the tests expand into toys, dildos, vibrators, oral sex, squirting, multiple positions, and bareback penetration. Their tight pussies keep his hips moving until he pumps a huge load into each stylish participant.