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There are members in more than 100 countries around the world.
Activities include the exchange of ideas through lectures, discussions, journals, special-interest groups, and local, regional, national and international gatherings; the investigations of members' opinions and attitudes; and assistance to researchers, inside and outside Mensa, in projects dealing with intelligence or Mensa.
A key study of births for the period 1962 to 1980 in 24 countries in Europe showed a sex ratio of 105–107, with a median of 105.9 (5).
The latter figure is widely used as the baseline for calculating deviations in the sex ratio.
Data were used from large-scale gay, lesbian, and bisexual (GLB) community events in New York and Los Angeles collected between 20.
In total 1178 men who have sex with men (MSM) responded to questions about the use of the Internet, willingness to have unplanned UAI, intentions toward planned UAI, and “barebacker identity.” Compared to nonbarebackers, barebackers spent significantly more time on the Internet looking for sex and looking for dates.
In particular, births occurring at home and births of unwanted or abandoned infants often go unrecorded.
In China, the One Child Policy presents specific challenges to accurate data collection because there may be collusion between parents and authorities to hide births that are not approved within the Policy (3).
The “population sex ratio” refers to the total number of males for every 100 females in the population.
This son preference is manifest in sex-selective abortion and in discrimination in care practices for girls, both of which lead to higher female mortality.
Differential gender mortality has been a documented problem for decades and led to reports in the early 1990s of 100 million “missing women” across the developing world.
The large cohorts of “surplus” males now reaching adulthood are predominantly of low socioeconomic class, and concerns have been expressed that their lack of marriageability, and consequent marginalization in society, may lead to antisocial behavior and violence, threatening societal stability and security.
Measures to reduce sex selection must include strict enforcement of existing legislation, the ensuring of equal rights for women, and public awareness campaigns about the dangers of gender imbalance. In 2004, males accounted for 50.4% of the global total (1), but in some regions of the world the proportion is considerably above this average.