同性婚姻的英文：
homosexual marriage
gayriage (gay marriage)
lesriage (lesbian marriage)

参考例句：

Connecticut has allowed same-sex marriage since november.
康涅狄格州自11月起已经允许同性婚姻。

homosexual是什么意思：
adj. 同性恋的
n. 同性恋者

The country bans homosexuality outright.
这个国家完全禁止同性恋。

I never knew he was a homosexual.
我从来不知道他暗地里搞同性恋。

Aversion to gay or homosexual people or their lifestyle or culture.
同性恋恐怖症对同性恋者或其文化或生活方式的厌恶

marriage是什么意思：
n. 结婚；婚姻生活；婚礼

an irregular marriage.
不合法的婚姻

You will notice the drift in this marriage.
在这桩婚姻中你会注意到流向。

Marriage comes by destiny
姻缘命中定

gayriage是什么意思：
n. 同性婚姻

Gayriage refers to marriage to a person of the same sex.
Gayriage指的是两个性别相同的人结成的婚姻。

When two men get 'married', it is a gayriage, while marriage between a woman and a woman is a lesriage.
两个女人结成的婚姻，就叫lesriage。