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So goes a common belief, which asserts that sperm with Y chromosomes—those make male babies—swim faster, so you have a better chance of having a daughter if the sperm has to travel a long way to the egg. The idea has no scientific merit, but researchers have now found a way to make it true in mice, sort of. The scientists incubated mouse sperm in a mixture containing molecules that would bind to the receptors and activate them. The molecules slowed energy production in X-chromosome sperm while not affecting the Y-chromosome sperm at all, the team reports today in PLOS Biology.
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Sperm sorting

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Changing sperm speed can influence offspring’s sex, mouse study suggests | Science | AAAS

Methods of Gender Selection While there is an overwhelming amount of information on the Internet about gender selection options, please be careful as much of this information is filled with scams, old wives tales and unproven techniques. There are only 2 proven techniques that may affect the gender of your children. Our office uses a proprietary method of sperm sorting with insemination. These methods work on the premise that they separate the X and Y-sperm by use of centrifugation. During centrifugation, controlled spinning causes particles in a sample to become sorted into layers according to density of those particles. Sorting separates the more dense X-sperm from the lighter Y-sperm.
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Methods of Gender Selection

Sperm sorting is a means of choosing what type of sperm cell is to fertilize the egg cell. Several conventional techniques of centrifugation or swim-up. Newly applied methods such as flow cytometry expand the possibilities of sperm sorting and new techniques of sperm sorting are being developed. It can be used to sort out sperm that are most healthy, as well as for determination of more specific traits, such as sex selection in which spermatozoa are separated into X- female and Y- male chromosome bearing populations based on their difference in DNA content. The resultant 'sex-sorted' spermatozoa are then able to be used in conjunction with other assisted reproductive technologies such as artificial insemination or in-vitro fertilization IVF to produce offspring of the desired sex - in farming animals but also in human medical practice.
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And then the follow-up question is virtually almost always: But what are the health benefits of semen? But it turns out the health benefits of consuming semen go far beyond that. I know sex in general can put a smile back on my face, but I never thought it had anything to do with semen. According to a study conducted on female college students at the State University of New York in Albany, exposure to semen can lower symptoms of depression. The study compared female students who were having sex with condoms versus those who were having sex without, and found that the latter group overall showed fewer signs of depression.
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