For many couples, about 38 percent globally, the best thing about their relationship was the sex, according to the poll. This was especially true for Brazilians. Nearly 60 percent said that nothing could make them happier than having a good sex life.

But the Japanese, South Koreans and Britons tended to value other qualities in their partner. Only 15 percent of Japanese ranked their sex lives above all else as a source of contentment.

Single people in the same three countries also reported a resilient independence, with only a third or less of single Japanese, South Koreans and the Britons saying finding someone to settle down with was the most important step in their search for happiness.

Single Indonesians were the most preoccupied with finding a mate. Nearly 70 percent said nothing could make them happier, followed by 57 percent of Turks and 56 percent of Mexicans.

But even among couples who lived together, the poll found signs of restlessness with slightly more than a quarter of people in such relationships saying that finding someone else to be with would make them happiest of all.

Ipsos interviewed 21,248 in an online survey in Argentina, Australia, Belgium, Brazil, Canada, China, France, Germany, Great Britain, Hungary, India, Indonesia, Italy, Japan, Mexico, Poland, Russia, Saudi Arabia, South Africa, South Korea, Spain, Sweden, Turkey and the United States.

Fifty-nine percent of the people surveyed said they were married or living with their partner, while 41 percent said they were not.

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