If you want a baby girl?
Husband to avoid deep penetration in the female vagina during copulation.
If you want a baby boy:
Deep penetration by the husband is suggested.
Reasoning:
Characteristics of X and Y spermatozoa
X: Marathon runner with the stamina
Y: Sprinter but poor stamina
So, with the deep penetration, the chances for Y to reach destination will be higher.
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