When women choose the "best genes" for their childeren, they assume that their child will be a boy.

You see this argument a lot from women: "we choose tall guys because we want better genes for our childeren". But they forget that men have X AND Y chromosomes. Some women who have childeren from ugly tall men get ugly daughters who later become LVW, instead of a tall son. Also, some women who have childeren from average heighted men get a perfect daughter. Some men shorter than 6' can have a high quality X chromosome. Also, some tall men can have a low quality X chromosome.