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The results of research regarding public knowledge and reactions about sex determination are reported. Ancient ideas and folklore are related. Because X sperm are heavier than Y sperm they can be separated by centrifuging. This has been shown to be effective in cattle breeding with insemination. Electrophoresis of rabbit semen has been used with insemination and correct prediction of sex in a large proportion of cases. Human sperm can also be separated by this technique. In vitro separation followed by artificial insemination seems to be the only promising method for the near future. Use of alkaline douches after intercourse to select against X sperm has not been successful. Shortly after ovulation the ova is high in the fallopian tube. As Y sperm are thought to move faster than X sperm intercourse soon after ovulation has been recommended as giving a greater chance for female offspring. Problems are likely to arise if successful control of sex determination becomes practical. There is a preference for male babies in many diverse cultures throughout the world. Preference for at least 1 child of each sex has been reported to have had a significant influence in determining whether those with children want to have an additional child. A questionnaire related to the subject was distributed to 438 students at 3 Florida colleges. Of these 283 (64%) were returned. Of these a large majority preferred male over female children especially for the 1st child. For the 2nd child more wanted a girl if the 1st was a boy. Attitudes toward sex determination were unrelated to fathers occupation or parents education. Black and male respondents favored sex-choosing more than did white female respondents. Catholics were more often opposed to the innovation of sex determination. Those listed as having no religion had the most favorable attitudes. Data suggest that if sex-choosing were widely adopted initially 122 males would be born for every 100 females. Sex-choosing might lower the birthrate in countries where son survivorship is desired.
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