Airline Bathrooms

For people who know me really well, we’ve probably had a chat at one time or another about genderized bathrooms.  My question is: why are people so concerned about having separate male/female bathrooms when nobody complains about sharing bathrooms on airplanes?  I’ve heard several comments about unisex bathrooms, here are a couple with my thoughts:

• Men are dirtier than women, and women expect higher standards of cleanliness – This may be news to some, but I know for a fact that women are fully capable of peeing on the toilet seat too!
• Someone might see someone else naked – In general I’m only talking about single stall bathrooms with a lock on the door, but how many times do you go into a single-sex bathroom and see someone else naked?

And now my third, and in my mind deal-making, point is that people are obviously capable of sharing bathrooms among the sexes because they do it all the time on airplanes (and on trains, too).