“Public Display of Affection or PDA as they are called, is the act of two people indulging in an intimate act in public.” 
It is an act that is mostly objectionable to the public. Today, Public Display of Affection is something that most couples indulge in the beginning of their days of physical exploration and discovery.
“PDA is the physical demonstration of affection for another person while in the view of others. Holding hands or kissing in public are commonly considered to be unobjectionable forms of public displays of affection; however, what is considered objectionable depends on the context and social norms. For example, in places such as bars, nightclubs, and strip clubs, more extreme forms of public displays of affection are rarely considered to be objectionable.” 
“Public display of affection depends on the decision of the couple. Individual and societal views on Public Display of affection vary significantly. Such displays may sometimes be considered to be in bad taste, while in some jurisdictions such displays may even be criminal. Depending on the social values and context, extreme forms of public displays of affection may be considered indecent exposure.” 
Affection is an important part of any relationship. It makes a person feel warm inside when someone of his resemblance or even love lets the person know how he or she feels. This feeling is best expressed behind closed doors. Kisses and physical connection are the tools people use to display their affection. These tools will effectively free their feelings and allow themselves to be close.
A. Social views
Public display of affection affects people in different ways and one should be mindful of the feelings that can be elicited by 'carrying on' in public. When a couple is feeling passionate they may be oblivious to the presence of people around them, but they may accidentally hurt someone.
Someone who has just lost a loved one may find their public display of affection heartbreaking; a reminder of someone they can no longer kiss. Someone who has ended a relationship may find it agonizing as a reminder of the one that had gone away. Older people may find it annoying as their generation was more modest and saved serious affection for times when the intimacy could be carried further than just holding hands and kissing. Single people and lonely people will feel similarly as it will remind them of the fact that they are alone. A consideration of the kind of people around the place will save everyone from feelings of resentment or in some cases, embarrassment.
We find that the heart of PDA is intolerance and insecurity. In conversations with people about why such sights bother them - or don't bother them – jealousy is an interesting common factor. Those who are in relationships themselves are rarely bothered by other's exhibitions of affection, even if they preferred to show their love in private. However, those who are not, especially those who have recently had a break-up, are morbidly horrified by any sight of love between other people.
Although holding hands is considered sweet by most people, it is rarely considered acceptable to openly kiss someone passionately in public because it is not polite, and going further than that is illegal and a crime in some places especially in conservative countries like India. B. Psychological views
Public Display of Affection (PDA) can either be approved or disapproved. A person’s perspective might be different from someone else’s view on PDA.
As our society tends to do what we think other people approve of or disapprove of, for example, an aggressive couple stopped their behavior because it was not approved. Injunctive norms can make a major impact in someone’s behavior and change that certain behavior to create a positive behavioral change. Certain public displays of affection are appropriate in some places than others. For example, in a...