The one about sex likely is referring to individual instances of sex having a higher chance if sex is generally more common
like, yea having sex once every 4 or 5 days should give you a 100% chance of having viable sperm around when the ovulation happens,
What the article is likely referring to is the biological response the female body to being consistently given sex, specifically the changes to the immune system as the body reacts to the frequent sex by preparing itself to host a fetus.
Whether a fertilized egg is able to successfully become hosted by the womb is a dice roll directly affected by the readyness of the immune system of the mother, frequent sex makes the immune system more ready for that dice roll.
like, yea having sex once every 4 or 5 days should give you a 100% chance of having viable sperm around when the ovulation happens,
What the article is likely referring to is the biological response the female body to being consistently given sex, specifically the changes to the immune system as the body reacts to the frequent sex by preparing itself to host a fetus.
Whether a fertilized egg is able to successfully become hosted by the womb is a dice roll directly affected by the readyness of the immune system of the mother, frequent sex makes the immune system more ready for that dice roll.