>>735
科学的論拠があるんだけど
https://dual.nikkei.com/article/034/27/14_3427_03.gif
Rothman, K. J. et al.
Volitional determinants and age-related decline in fecundability:
a general population prospective cohort study in Denmark.
Fertil. Steril. 99, 1958?1964 (2013)