This chapter analyzes behaviors and attitudes of the Guangzhou youths （2016-2017） when they are faced with problems concerning love and marriage，sexual behaviors and reproduction，etc. The research indicates that men and women who have first love and first sexual behavior are different in average age. Respondents generally oppose cyber love，extramarital love affair，divorce，family violence，illegitimate child，DINK and others，but support pre-marital property notarization，housework sharing after marriage，etc. Youths who have worked are apt to oppose homosexual act，but college students relatively approve homosexuality. A majority of families are willing to have a son and a daughter. Now，unstable marriage is the most serious problem ahead of the youths.