Indications from genetic research are that humans may have about twice as many female ancestors as male according to some theory about discrepancy in the "time to most recent common ancestor" for mitochondrial DNA (extrapolating for female ancestors) and the nonrecombining portion of the Y chromosome (extrapolating for male ancestors).

I think the presence discrepancy is reasonably well accepted.

https://academic.oup.com/mbe/article/21/11/2047/1147770