College students' love, sex, and gender: from temptation to attachment What are the types of marital violence and male marital violence? How confident are you? How much trust is there? What is your attachment type? Four keys to human behavior, three elements of love, improved nutrition, three plus one principle of sex, universal love, six questions about good communication, gender choice and freedom, and five stages of intimate communication: confirmation (legal) period, chat period, invitation period, and holding hands Period, embrace period [each period must not be too fast for one month].