Some people may engage in swinging to add variety into their otherwise conventional sex lives or due to their curiosity.
One 2000 study, based on an Internet questionnaire addressed to visitors of swinger-related sites, found swingers are happier in their relationships than the norm.
Different clubs offer varied facilities and atmospheres, and often hold "theme" nights.
In 2018, a study of the prevalence of nonmonagamous practices in the United States estimated that 2.35% of Americans currently self-identify as swingers and 4.76% had identified as swingers at some point in their lifetime.
Swingers may reduce the risk of STI by exchanging STI test results and serosorting.
Proponents of swinging argue that safe sex is accepted within the swinging community and the risk of sexual disease is the same for them as for the general population – and that some populations of sexually non-monogamous people have clearly lower rates of STIs than the general population.