Legalising same-sex marriage may create a healthier environment for gay men, say US researchers.
The number of visits by gay men to health clinics dropped significantly after same-sex unions were allowed in the state Massachusetts.
This was regardless of whether the men were in a stable relationship, reported the American Journal of Public Health.
A UK HIV charity said there was a clear link between happiness and health.
Research has already suggested that gay men are more likely to suffer from depression and suicidal thoughts than heterosexual men, and that social exclusion may be partly responsible.
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