Five typologies were identified: the professional prostitute, the occasional prostitute, the romantic heroin user, the loyal heroin user, and the enlightened, romantic heroin user. The professional prostitute typically came from a lower-class background and entered prostitution through boyfriends. Heroin use arose either from the prostitution working environment or through boyfriends. So long as they could continue to earn a living as a prostitute, they saw no need for drug treatment. The occasional prostitute typically came from the lower middle class and used prostitution as a means of obtaining money when needed. Heroin use emerged through the prostitution subculture. Occasional prostitutes were particularly resistant to treatment because of their resistance to the image of themselves as heroin addicts. The romantic heroin users derived justification for heroin use and prostitution from a romantic and economic involvement with a man. Some of this group were willing to give drug treatment a try. Loyal heroin users entered heroin use and prostitution through a best friend, were generally sorry for having done so, were frequent users of treatment programs. The enlightened romantic heroin user received no satisfaction from either heroin use or prostitution as a structure for maintaining a romantic relationship. They typically did not seek treatment while living with a partner.