Both parties have to register their fingerprints using a biometric scanner that's plugged into the washing machine, which will only work if it scans a different finger than the one used before (you could also trick the machine and use two of your own fingers when you first set things up, but you'd onlybe fooling yourself right?).
In this vision of the future networks will disband just as fast as they came together so learning to work with yourself and onlyyourself is going to be crucial to your success.