This study attempts to explore the differences and consensus of sexual relationships through a series of studies on the Ko's Sexual Relation Scale. First confirm that the Ko's Sexual Relation Scale constructed by Ko (1999) is an original self-reported scale for sexual offenders, and point out the differences in sexual relations in the scale. Chiu (2017) revised the Ko's Sexual Relation Scale to meet the needs of juvenile sexual offenders, and further confirmed the differences and consensus of the sexual relationships. Finally, it is proposed that the scale can be used to find the deviation of the case on the norm in practice, and invite the case to return to the norm.