PDA...How much is too much?

PDA...not the thing you use to keep your schedule...public display of affection. I'm personally an advocate of PDA. I think it's important especially in intimate relationships to feel comfortable to openly express your affection for another person. However, with all things...it's good in moderation. Over killing the PDA can make for a very uncomfortable situation for others who unfortunately fall victim of the situation. Prime example, I was in the line the other day at the store and got a bit more bang for my buck than I really ever wanted. While waiting for my turn to check out with the rest of the many customers at the grocery store on a busy Sunday evening, I was subject to the couple in front of me that forgot they weren't in their bedroom. Now like I said, I am all for PDA...holding hands, a quick kiss, heck I can even handle a little tap on the tush (I'm trying to be liberal here; work with me). However, I do NOT want to see a couple groping each other while I'm trying to stock up on my soy milk and fresh fruit for the week. I honestly don't want to see anybody 'squeezing the melons' as if they are looking for concealed weapons and swapping major spit in public. It really is awkward for onlookers as they start giving each other the "OK let's try not to look at the elephant in the room" face. So please ladies and gentlemen, love each other freely with PDA but realize that you should probably keep some of that for later and be sure not to taint people's innocent precious eyes. Hahaha (go with it people). OK?! Glad we cleared that up :o)

So, how do you feel about PDA? Is there a limit? Or am I just being a prude?