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Although coordination between partners has been considered in the clinical literature as an indication of intimate relationships, the influence of simple motor synchrony on the experience of intimacy has not been established yet. Four studies examined whether synchrony, temporal alignment of simple motor periodic behaviors between partners, instilled a sense of intimacy. In Study 1, same-sex strangers discussed positive or neutral events while their motion synchrony and experiences of intimacy were measured. In Study 2, same-sex strangers pedaled bicycles in either synchronous or asynchronous rhythms while discussing personal events and then rated how intimate they felt. Studies 3 and 4 examined whether the effect of synchronization would generalize to perceptions of intimacy and desire among romantically involved heterosexual participants. Results showed that key aspects of intimacy were associated …