In this world, a rule has been established where men must wear an "Ejaculation Beginner Mark" on their chest for one year, and those marked are generally entitled to receive sexual services from women. Girls willingly and cheerfully accept various erotic acts—including breast groping, titty fucks, handjobs, blowjobs, and facials—with open enthusiasm. This single mark effectively turns every girl in the city into a living handjob.