How long do male sperm last
Since sperm with the male chromosome have a short lifespan, if couples want a boy, they should have intercourse as near to ovulation as possible.
But another found hig-calcium diets are more likely to give you a girl.
In this study of billionaires Bill Gates is at the topmen who inherited their money heirs were more likely to have sons than both self-made billionaires and the general population.
How long do sperm live in a hot tub?
Since then, the evidence has been mixedbut leans towards disputing any effect of timing on sex selection.
The information will indicate when ovulation takes place so timing sex can be arranged.
In the s, the idea that timing sex around ovulation can tip the odds in favour of a girl or a boy was popularised by Shettles and Rorvik in the best-selling book How to Choose the Sex of Your Baby.
Once inside the female reproductive tract, the sperm cells must swim through the cervix and into the uterus to reach the fallopian tubes and female egg.