Two-thirds of respondents said their sex lives are more emotionally satisfying now than when they were in their 40s, and 79 percent of men and 66 percent of women said that maintaining an active sex life is an important part of their relationship with their partner.

CNN: Sex after 60: You betcha, survey says

He also said that even though he believed that "everyone should be allowed to do what they liked with their lives", legalising same-sex marriage made him think of "the end of the world".

BBC: Profile: Horacio Cartes

After reviewing data on how married couples in the U.S. tackle housework, as well as self-reports of how often they enjoyed intercourse, sociologists at the University of Washington (UW) say that couples who shared the burden of chores -- cooking, cleaning and caring for the lawn -- tend to have the least active sex lives.

CNN: Why husbands who share household chores miss out on sex