An account in an item rental service is shared with others using computer-implemented profiles, subject to computer-enforced constraints. In one embodiment, a method provides for establishing a user account, wherein the user account is associated with an account owner, wherein the user account comprises a first ordered queue indicating two or more items that the account owner desires to rent; receiving a request to add a second ordered queue to the user account, profile member identifying information, and a constraint value; creating and storing a profile record based on the profile member identifying information and the constraint value, wherein the profile record is further associated with a second queue; receiving a request to add a specified rental item to the second queue, wherein the specified rental item does not conform to the constraint value; and adding the specified rental item to the second queue only in response to receiving confirmation by the account owner.