But few attempts have been made to dispassionately dissect the issue from an academic, science-based perspective.
In 2005, the American Psychological Association released a brief reviewing research on same-sex parenting.
It unambiguously summed up its stance on the issue of whether or not same-sex parenting negatively impacts children: Same-sex marriage has already been legalised in 23 countries around the world, inhabited by more than 760 million people.
A US study that surveyed more than 36,000 people aged 18-70 found lesbian, gay and bisexual individuals were far less psychologically distressed if they were in a legally recognised same-sex marriage than if they were not.
Married heterosexuals were less distressed than either of these groups.
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There are considerable mental health and wellbeing benefits conferred on those in the fortunate position of being able to marry legally.
And there are associated deleterious impacts of being denied this opportunity.