Then how would you explain western-African men? Surely, they have been subjected to starvation and other stressful environmental circumstances that has affected their genes, but their masculine features remained relatively unchanged (it seems, though i could be wrong). Or you can argue that they are more successful at foraging than our ancestors back in the day or perhaps they didn't experience as many droughts, but I highly doubt it. I think you are underestimating our genes ability to self-replicate itself perfectly despite our environmental challenges.
I dunno, the average west African is a manlet