Recent studies suggest that sexual aggressors of women are characterized by early- and late-onset antisocial trajectories. However, these studies have not examined the role of mating effort and its role on sexual offending in adulthood. This study examined differences in the level of mating effort of early- and late-onset offenders and the association between mating effort and sexual offending in adulthood. Factor analysis identified two latent constructs of sexuality: mating effort and high sexual drive. Early-onset offenders exhibited significantly higher levels of mating effort and sexual drive. Furthermore, high mating effort and high sexual drive were more strongly associated with an earlier onset and a higher frequency of sexual crimes in adulthood than group membership. This study provided empirical evidence that a developmental taxonomy of early and late onset distinguishes the sexual activity and sexual criminal activity of adult sexual aggressors. The findings are discussed in light of a developmental taxonomy of sexual aggressors of women.