Why do people do this, and how can it be right? There is in such an act a blatant lack of regard for others who might not want to have to look at your ugly bodies all over each other. It also shows a lack of self control, which makes me think less of you. It should be banned, banned forever, to the chagrin of voyeurs and masturbators, worldwide.
People should never display affection in public. It should be private.