motion sensors wired in parallel

You could do it on some alarm panels via panel programming. In the G series Bosch panels: The Cross point option is designed to reduce false alarms. To achieve this, program two or more points within a Cross Point Group. A Cross Point Group generates a Cross Point Alarm event when all points in the group are faulted within the Cross Point Time. These points need the Cross point option enabled in their corresponding point indexes to generate this event. Refer to Section 6.9 Cross Point Parameters on page 137 for additional programming requirements to program the Cross Point Timer. In the new DSC Power Series there is cross zoning as an attribute. I don't know if it works on wireless zones.

With Napco panels you could program the two different zones they are programmed to as a "zone anding group."