Everyone seems to be quick to reduce the gender disparity in seniority/paygrade of jobs occupied to a childcare/parental leave/homemaking question, but is there

Everyone seems to be quick to reduce the gender disparity in seniority/paygrade of jobs occupied to a childcare/parental leave/homemaking question, but is there any data for the single, infertile or asexual segment of the population to back this up? My impression always has been that long before parenting even starts being relevant, there is a difference between the genders in terms of readiness to engage in self-sacrificial or -destructive behaviour for the sake of self-realisation and status climbing (which is often correlated to pay in one way or another). Regardless of whether this difference is predominantly biological or cultural and which gender deserves the "blame" for it if it is the latter, I think that any attempt to reduce the disparity by policymaking should at least try to address this.