- For a boy, it’s best if men wear loose pants more often. It’s to increase fertility where testes need lower temperature so that the sperm stays alive and because XY sperm has weaker vitality, then it could help than the XX sperm, but it is not recommended to do otherwise (wearing tight pants).
- For a girl, it’s recommended if men take a warm shower soon before having sex. This way XX sperm has more chance
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