Using these, they will select one male for extensive study, and return to their planet for three years. The first person to notice this will be a husband or SO somewhere who notes the laundry has not been done for several weeks and begins to investigate. Watch for that posting. Sadly, some men will never notice at all. Oh, and there's far fewer women than men out here in cyberspace.
Patience is a virtue.
And besides, a patient human just really totally confounds and annoys a cat.