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survival sex

n. prostitution in order to provide funds for food, shelter or drugs.

Wikipedia
Survival sex

Survival sex is prostitution engaged in by a person because of their extreme need. It describes the practice of people who are homeless or otherwise disadvantaged in society, trading sex for food, a place to sleep, or other basic needs, or for drugs. The term is used by sex trade and poverty researchers and aid workers.

Some thinkers suggest that people are motivated to prostitute themselves because it is familiar – specifically to victims of child sexual abuse. Other researchers state that, while some see it as a normal job, the vast majority want to get out of the industry given the potential for disease and dangerous clients.