Peter Tatchell has said it is important children learn that "love is a good thing", amid complaints over a Birmingham primary school teaching pupils about homosexuality.
The human rights campaigner appeared on the Mike Graham show to discuss parents removing their children from classes at Parkfield Community School, claiming the relationship lessons were promoting gay and transgender lifestyles.
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However, Mr Tatchell argued that pupils "need to know" about the various types of relationships people enter into.
"Some of these young kids will grow up to be lesbian, gay, bisexual, transgender themselves," Mr Tatchell told talkRADIO's Mike Graham. "They need to know that love - whether it's same-sex or opposite sex - is love and love is a good thing."
'Love is love'
Parkfield Community School headmaster David Williams.
Last week, 600 Muslim children aged between four and 11 were taken out of the school by parents in protest at the lessons, which are part of a programme to challenge homophobia.
"These lessons are all about trying to create a society where we understand others who are different from ourselves, where we don't bully them or tease them," Mr Tatchell added.
"I think they [the parents] have unfounded fears. These lessons are not about sex."