The purpose of this paper is to emphasize and evaluate the representations and practices of proximity among social workers and sex workers. This ethnography is part of a nationwide program supported by the French Ministry of Health that consists of 28 projects designed to test various facets of health assistance. This multi-site study brings together three distinct configurations that highlight the different actions taken by the association's three branches. This article explains, on the one hand, how the intervention professionals thought about, built, and established relationships with the people they support, and, on the other hand, how the latter experience this proximity.