A guy and girl next to me at Starbucks were passing the time in a very vigorous public display of liplocking. (And their eyes weren\u2019t even closed.) I suppose I\u2019m old school because I believe that sort of sport should be reserved for the privacy of your bedroom, if not the basement, and there should be no spectators. Some things are best done behind closed doors. Richard Nixon said that. With four daughters, I occasionally revert to thinking like an old-fashioned father, when I probably should mind my own business, but there was nowhere else to look. I was overcome by embarrassment, which is my usual neo-Victorian response to a public display of lust, also known as a PDL, and not to be confused with a PDA or public display of affection. A peck on the cheek is one thing, but Frenching is an entirely different matter. When they placed their order, I realized the girl\u2019s accent was, indeed, French. Being continental entitles you to engage in PDLs anywhere in the European Union, particularly Paris, and the New York metropolitan area, although Brits will lose that privilege when they leave the EU. That night, I told my wife about my adventure and cautiously asked, \u201cWere we like that?\u201d I don\u2019t recall public groping or smooching. On the other hand... Nothing can compare with the PDLs by the world\u2019s richest man, Amazon founder Jeff Bezos, and his paramour Lauren Sanchez, who according to reliable sources in the National Enquirer and the New York Post have been \u201cmaking out like teenagers\u201d in restaurants and on street corners across Southern California since they dumped their spouses. It\u2019s been so long since I was a teenager, I can\u2019t remember how they \u201cmake out.\u201d Normally, I\u2019d say, \u201cGet a motel room!\u201d With Bezos, I\u2019d recommend, \u201cBuy the Beverly Hills Wilshire and get a suite!\u201d However, in America everything is protected under the Bill of Rights, especially if you\u2019re the richest man in the world. If women and men can lawfully walk topless on the streets of New York, a couple is within its rights to grope and grind even on the floor of Congress, although they should come up for air when it\u2019s time to take a vote. These displays of lust were tame compared with one I witnessed on Metro-North. Forever emblazoned in my mind was the night I wandered through the deserted cars of a late train out of Manhattan and came upon a couple in flagrante delicto. I was tempted to pull the emergency brake but for their safety and everyone else\u2019s, I decided not to. I\u2019m a man hobbled by the constraints of a virtue that has been excised from our social mores, a virtue known as \u201cmodesty,\u201d which probably seems puritanical to most people, particularly the celebrity class. But don\u2019t knock the Puritans. They gave us Thanksgiving, which is more than Hollywood gave us. Sometimes my daughters are bigger prudes than I am. Throughout our marriage, they always squirmed in discomfort over PPDAs \u2014 parental public displays of affection \u2014 \u00a0even in the privacy of our home. Most things parents do make teenagers uncomfortable, although they have no problem doing those things themselves. As I was leafing through the church bulletin, I saw an ad for Catholic singles match that pictured a couple nuzzling necks like two puppies. Then, I spotted a guy in church who had his arm around his girlfriend\u2019s waist throughout the service. Is touching appropriate in church? Pop psychologists say PDAs are good for a relationship because they show a couple has no inhibitions about expressing affection in front of others, in church or a PTA meeting, whether it\u2019s holding hands, snuggling, smooching or hootchy-kootchying. Studies suggest public affection can lower your blood pressure and heart rate, although it may do dangerous things to your respiration. So during the new year, I resolve to do more pawing and puckering in public ... if my wife agrees. Joe Pisani can be reached at email@example.com.