With the loosening of industry censorship constraints, the 1960s saw a major expansion in the commercial viability of a variety of B movie subgenres that became known collectively as "exploitation films". The combination of intensive and gimmick-laden publicity with movies featuring vulgar subject matter and often outrageous imagery dated back decades—the term had originally defined truly fringe productions, made at the lowest depths of Poverty Row or entirely outside the Hollywood system. Many graphically depicted the wages of sin in the context of promoting prudent lifestyle choices, particularly "sexual hygiene". Audiences might see explicit footage of anything from a live birth to a ritual circumcision. Such films were not generally booked as part of movie theaters' regular schedules but rather presented as special events by traveling roadshow promoters (they might also appear as fodder for "grindhouses", which typically had no regular schedule at all). The most famous of those promoters, Kroger Babb, was in the vanguard of marketing low-budget, sensationalistic films with a "100% saturation campaign", inundating the target audience with ads in almost any imaginable medium. In the era of the traditional double feature, no one would have characterized these graphic exploitation films as "B movies". With the majors having exited traditional B production and exploitation-style promotion becoming standard practice at the lower end of the industry, "exploitation" became a way to refer to the entire field of low-budget genre films. The 1960s saw exploitation-style themes and imagery become increasingly central to the realm of the B.