An anti-abortion group has stepped up their campaign to stop equal marriage from becoming legal in the UK.

Society for the Protection of Unborn Children has sent leaflets to British homes in a way of spreading their anti-gay message.

Titled ‘Stop David Cameron destroying Britain’s families’, the group argues legalizing same-sex marriage will have a devastating effect on children.

They fear ‘children and teenagers at school will quickly learn about “gay marriage”’ and ‘gay relationships will be promoted to primary school children via storybooks’.

‘Being male or female will be meaningless, if any combination can get married,’ SPUC says. ‘Marriage will be reduced to gratifying your own personal desires.’

The group says the ‘human cost of legalizing “gay marriage”’ is that children will lose out because society will no longer ensure the biological mother and father bring them up.

SPUC wants people to write to their member of parliament, show their support by ordering a car sticker and donating to their group.

Peter Tatchell, veteran gay rights campaigner and director of human rights organization Peter Tatchell Foundation, condemned the group’s campaign.

Speaking to Gay Star News, he said: ‘It’s ironic that SPUC calls itself the Society for the Protection of Unborn Children yet it opposes the rights of born gay children and adults.

‘Its stand is totally inconsistent. SPUC is very selective about the rights and freedoms it defends.’

The marriage equality bill in England and Wales finished the committee stage on 12 March, and is due to have a report stage and third reading in the House of Commons at a date yet to be confirmed.

Alternative legislation for equal marriage is currently being consulted on in Scotland.