Arse grabbing? oops. I think there is a difference between arse grabbing and bottom stroking. As there is a difference between holding hands and shifting hands below clothing. But the big difference is the way and mood you do it in. I've seen people exchanging a tiny kiss on the nose tip who made that an ugly display of pretentious sexual action. And then there is this fond memory of a caribbean couple in the London tube full of affection and tender stares and holding hands and sharing a few shy kisses. I could not turn away to avoid watching them. I was crammed in between some folks.