"Sex education is always going to be controversial, but there are probably two main reasons why this particular curriculum is controversial," Peter Jon Mitchell, a researcher at the Institute of Marriage and Family Canada, told CTV News Channel on Wednesday.
Parent groups and other protesters have argued that the curriculum contains some content that is not age-appropriate, he said.
"Some parents feel that it's just too much, too soon."
Others feel that they should have been consulted on the changes before they were put in place, he said.
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