Just what the question says. Are you comfortable with it? Do you care if others do it around you?
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I assume public displays of affection refers to more innocent things like holding hands, pecking kisses, sitting on laps, and things of that nature, as opposed to public displays of lewdness, like grabbing eachother in sexually charged areas like breasts, butts, and so on.
Modern men and women have become so distrustful of eachother that they distance themselves from eachother, where the genders are beginning to segregate in much the same way as the races. For this reason, I consider it, not just romantic, but patriotic to engage in public displays of affection.1