This study uses a very strange subset for its sampling:
Quote:
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The Chinese Health and Family Life Survey includes information on the sex lives, income, education and other personal details on 5,000 people across China, based on interviews and questionnaires. Among these were 1,534 women with husbands and boyfriends.
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The sample was 5,000 people in China (although the article shows pictures of Caucasian people) and among those, only 1,534 had husbands or boyfriends. So the other 3,500 were casual hookups? According to the article, they only used the 1,500 for their study and there was a numerical correlation between orgasms and spouses income.
In China.
Where we know everyone is treated equally. Where the poor work in sweatshops.
Riiiiight. Nothing helps a sex life like working in squalor for 90 hours a week.
As they say, garbage in equals garbage out.