Pardon my PDA

Errr.....oops. No. That's not exactly the PDA I'm thinkin' of.

All this business about the lesbian couple kissing in public got me thinkin'... Who am I kidding? I'm always thinking! Or at least thinking things that  a good girl shouldn't be thinking.  But anyway...

It got me wondering...what IS it about  Public Displays of Affection? What is it about watching someone else being affectionate that bothers us so? I'm not talking strictly about gay or lesbian affection, although as I said before, ...