When out in public celebrating a holiday with friends, say an Irish holiday for example, you don’t need to squeeze your significant others ass with vice grip strength when you see other lesbians. It is generally understood that when you see two women holding hands that both women are off the market unless they approach you with an offer. There is no need to grab an ass so hard that you leave fingerprint imprints in order to mark your territory. Not only is it a bit trashy to watch, but it is also potentially bruising a lovely ass.
So, pass on a casual head nod as you walk past your fellow dykes, but stop assuming that we want to tap your ladies ass. Plus your hand is getting in the way of some nice eye candy.