I examine how same-sex marriage laws affect sexually transmitted infection (STI) rates, using country-level panel data from Europe. Dynamic difference-in-differences models show that same-sex marriage laws decrease the spread of shorter-term (syphilis, gonorrhoea) and longer-term infections (HIV, AIDS) among the general population. These effects are persistent over time and are much stronger than other same-sex relationship recognition policies. Further investigation reveals significant heterogeneity; same-sex marriage laws lead to sizeable decreases in all STIs among the most at-risk population for an infection, men who have sex with men, with additional positive externalities on the health capital of heterosexual men and women.

中文翻译：

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同性婚姻合法化和整个欧洲的性传播感染*

我使用来自欧洲的国家级面板数据研究同性婚姻法如何影响性传播感染 (STI) 率。动态差分模型表明，同性婚姻法减少了短期（梅毒、淋病）和长期感染（艾滋病毒、艾滋病）在普通人群中的传播。这些影响会随着时间的推移持续存在，并且比其他同性关系承认政策强得多。进一步的调查揭示了显着的异质性；同性婚姻法导致感染风险最高的男男性行为人群中所有性传播感染的感染率大幅下降，对异性恋男性和女性的健康资本产生额外的积极外部影响。