Speak to Grift3r in the southwest of the park. He tells you his little brother Tim and his friend went to the Beach to look at girls in their bathing suits. He asks you to bring them back.
Go to the Beach and speak to Tim who is hiding with his friend being a tree.
He tells you he won't come with you until he sees boobies.
Make sure you have a Meditation Pill in your inventory.
Use the pill to turn invisible and unclip Denise's bikini top. Morality decreases by 2.