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The Shettles Method is a child conception idea that is reputed to help determine a baby's sex. It was developed by Landrum B. Shettles in the 1960s and was publicized in the book How to Choose the Sex of Your Baby, coauthored by Shettles and David Rorvik. The book was first published in 1971 and has been in print in various editions ever since.
The Shettles method, first formally theorized in the 1960s by Landrum B. Shettles, proposes that sperm containing the X (female) chromosome are more resilient than sperm containing the Y (male) chromosome. The method advocates intercourse two to four days prior to ovulation.
A full bibliography of Shettles writings is available. [4] He was the developer of gamete intrafallopian transfer (GIFT), a breakthrough in fertility research Shettles developed the Shettles Method of sex selection that helps prospective parents conceive a child of the desired gender. To achieve this end, it utilizes a number of factors that ...
Shettles method; Landrum Shettles; Side effects of radiotherapy on fertility; List of South African provinces by fertility rate; Sperm; Sperm motility; Spermatogenesis arrest; Spermatozoon; Stillbirth; Sub-replacement fertility; Superfecundation
Shettles Method; Shidduch; Shoe fetishism; Short-arm inspection; Sikhism and sexual orientation; Sima Qian; Simone de Beauvoir; Singles Awareness Day; Singles event; Sinthome; Situational sexual behavior; Skoptic syndrome; Sleep sex; Slut; Smirting; Smoking fetishism; Snowballing (sexual practice) Social impact of thong underwear; Society for ...
Sperm sorting by flow cytometry is an established technique in veterinary practice, and in the dairy industry most female cows are artificially inseminated with sorted semen to increase the number of female calves (using sperm sorting is less common in other species of farm animals, however artificial insemination is common). [16]
The 'pull out method' or coitus interruptus is a method where the male will remove his penis from the vagina before ejaculating; this prevents sperm from reaching the egg and can prevent pregnancy. This method has to be done correctly every time and is best if used in addition to other forms of birth control. It has a failure rate of ...
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.