Wasted alcoholics and strung-out drug addicts do not understand that they are harming themselves, their families, the economy, the society and their species. They believe that they are harmless social drinkers or that they are just chipping because they are in denial.
People who are sexually active or who plan to be are even less able to perceive the suffering that they cause and endure. Unlike druggies and boozers, whose inane behavior is contrasted by the majority of people of earth, the sexually active have no large comparison group of long term celibates to demonstrate a superior adaptation. Without realizing it, they often heap on themselves and their society consequences similar in kind and severity to those perpetrated by alcoholics and drug addicts: