DNA2 : Metamorphosis (Vol. 1)

Sixteen-year-old Junta has a problem, whenever he thinks about a girl sexually, he throws up. Yet he's destined to become the Mega-Playboy who will sire 100 sons, who in turn will sire 100 sons apiece, and so on, producing a population crisis in the future. DNA manipulator Karin arrives from the future to prevent him from initiating a personal baby boom. She inadvertently injects him with a compound that periodically transforms the sniveling nerd into a suave dreamboat, creating the very problem she came to solve.