Sexploitation or "sex-exploitation" escribe a class of independently produced, low budget feature films generally associated with the 1960s and serving largely as a vehicle for the exhibition of non-explicit sexual situations and/or gratuitous nudity. The term is often considered to designate a subgenre of exploitation films as a whole. Sexploitation films were generally exhibited in urban grindhouse theatres, the precursor to the adult movie theaters of the 1970s and '80s that featured hardcore content. The term soft-core is often used to designate non-explicit sexploitation films after the general legalization of hardcore content. Nudist films are often considered to be subgenres of the sex-exploitation genre as well.