The father said: "I understand children need to be made aware of the world, but should we really be promoting fetishes in Year Nine? I don't think so.

"The first thing that stood out was 'suck their toes'. That's quite niche.

"There were some [ideas] I was really shocked at. I don't think they've hit the target demographic. There is no way I think a 14-year-old should be reading this.

"When I spoke to my daughter I said 'you do know this isn't the only way to do things?'

"Surely they can just enjoy each other's company. They can go for walks, watch a film, go to Burger King, go to the park.

"There's tons of things she can do that don't involved getting someone's big toe in her mouth."

Carl has urged educators to proofread this type of material in the future and think carefully about what they distribute to students.

He said: "We should be saying there are alternatives to the physical side of things, but I don't think we should be pointing them in the direction of every other possibility.

"I think when it comes to children, as parents and responsible adults, we safeguard them. There's certain things kids should learn about through their life.

"Kids like to explore and find things out themselves."