United States soft-rock band Train are "upset" after their song Marry Me was used in a New Zealand anti-gay marriage website.

Family First website Protectmarriage.org.nz featured the music video for Marry Me, but the San Francisco-based band was alerted to its use by a New Zealander through Twitter.

Train has now released a statement saying "it was upsetting to us that Marry Me, a love song with no boundaries, was being used to promote an agenda we don't subscribe to".

"We [Train] take the idea of marriage very seriously, and believe it is the right of all consenting adults, regardless of sexual orientation.

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