Reported partner knowledge of and involvement in adult baby/diaper lover (ABDL) behavior were examined based on responses from 1,795 male and 139 female members of the ABDL community. Individuals in a relationship often divulge their ABDL interests early in dating. Some partners may try ABDL activity initially, but most are not involved. Involved nonpartners may be sanctioned ABDL friends. Nonpartners are usually not involved in ABDL practices because ABDL participants view this as infidelity. Individuals who have never been in a relationship may be working to reconcile their ABDL interests with building a romantic relationship.