Do Sex Positions Determine Sex Selection?
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Do sex positions determine sex selection? Joana, 36, has three daughters and wants to conceive a baby boy. She asks OB/GYN Dr. Lisa Masterson if any sexual positions or timing of intercourse can assist in the conception of one sex over the other.

The concept of sexual positions and timing of intercourse in relation to the gender of offspring is known as The Shettles Method, named after OB/GYN Dr. Landrum Shettles.

“It’s the daddy that actually decides the sex,” Dr. Lisa says. “[The] mom can only contribute the X [chromosome], whereas the dad can contribute X and Y [chromosomes].”

The Y (male) chromosome-bearing sperm will move faster, but only live for about two days, while the X (female) chromosome-bearing sperm will move slower, but have a longer life span.

• Dr. Lisa explains which sex position can increase the risk of a urinary tract infection.

Other fertility and artificial reproductive techniques:
Sperm mapping
Help for infertility
In-vitro fertilization
At-home fertility tests
Fertility 411

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