It is natural to think that one person touches another when their bodies make direct contact. However, much of interpersonal touch is not like this. We often touch people through things like their clothing. But this raises a puzzle: how can you touch someone without directly touching them? Moreover, where particular moral violations and crimes essentially involve touch, an account of when one person mediately touches another is required to determine when the relevant wrong or crime has occurred. We introduce and articulate this puzzle (§1), reject five plausible solutions (§§2-4), and develop and defend our own account (§§5-6), on which one person touches another through some medium when the medium acts as a certain kind of personal boundary determined by social norms concerning intimacy. Note: There will be some limited discussion of sexual assa ...