“…Physical and psychological reasons are factors related to a person’s bodily function or psychological health. They refer to physical and psychological reasons, such as relief of pain, reducing stress, euphoria, protection against the cold, treatment for analgesic activities, combat fatigue, tiredness, staying awake, feeling more potent than usual, alleviating fear, pleasure-seeking and habits, prevention of withdrawal symptoms, craving or compulsive urges, mood improvement and increasing sexual performance (premature ejaculation/erectile dysfunction), and a sense of well-being [ 17 , 18 , 39 , 43 , 44 , 46 , 49 , 55 , 63 , 72 , 81 , 89 ]. Social reasons are factors related to a person’s social environment, including relationships, peer influences/pressure, influence of friends or partners, experimentation, novelty-seeking behaviour, and attempts to escape from troubles or stress in one’s social environment [ 39 , 43 , 60 , 81 , 109 ].…”