If your goal is to minimize pathogens transferred from seat to hand, you can think of the man's second seat manipulation as "zero cost" in the sense that their

If your goal is to minimize pathogens transferred from seat to hand, you can think of the man's second seat manipulation as "zero cost" in the sense that their hand is already contaminated and they'll need to wash thoroughly Man 2x, Woman 0x = 1 "contamination" cost incurred Man 1x, Woman 1x = 2 "contamination" cost incurred