Strong gender differences in reproductive success variance, and the times to the most recent common ancestors

► We develop a novel agent-based model (ABM) of a population of women and men. ► Our population has overlapping generation and different mating systems. ► We classify conditions reproducing the observed human female-male TMRCA ratio of 2. ► We find that high male-male competition is necessary to yield the TMRCA ratio of 2.