what the heck is he singing

A series of animated scenes depict various female characters in revealing clothing, including a character adjusting her yellow top, another lying down in a white lace bra, a character having her white top pulled down to expose her chest, a blonde character in a green and yellow bikini on a beach, a character adjusting her purple bikini bottoms, and a character in a school uniform being pointed at. The scenes are set in diverse environments including a room, a beach, and a school.