Rather than desperate to find out about the biology of sex and reproduction, young people’s main concerns are frequently across the changes to their bodies. Photograph: David Levene for the Guardian

As component to its sex education lessons, a west London primary school gave its year-six pupils the possibility to invite any question they wanted anonymously.

The 10 and 11-year-olds’ questions – with the lads posting right into a box to be answered by a male teacher, while a feminine teacher answered girls’ questions – revealed that rather then desirous to find out about the biology of sex and reproduction, the children’s main concerns were the changes to their bodies.

They desired to learn about where on their bodies hair would sprout – and the way long it’d grow. Girls desired to know the way wide their hips would grow, while boys desired to understand how much they’d sweat.

One boy plaintively asked: “Does puberty ever end”

Sex education in primary schools is an emotionally charged issue – although the term sex education itself is slightly a misnomer.

As Simon Blake, chief executive of sexual health charity Brook says: “It’s completely misleading to claim that four-year-olds are being taught about sex.”

In fact, some schools call the subject, covered in personal, social and health education, “growing up” or “bodies”.

Sex education is compulsory in schools, but lessons are sometimes element of science classes and don’t specialize in relationships. Last week MPs launched a bid to make education about relationships mandatory too.

“The standard of SRE varies plenty between schools,” says Lucy Emmerson, co-ordinator of the Sex Education Forum, a coalition of organisations that campaigns to enhance sex and relationships education (SRE) for youngsters and children.

She adds: “Within the best schools teachers regularly consult pupils about what they need to be told about and when. They have got a planned curriculum with SRE beginning in the beginning of primary school and being built on year by year. Because of this something topical can also be picked up and the instructor can address it in another lesson.

“Asking children to jot down their questions privately and post them in an anonymous question box is a superb approach to get around embarrassment that kids may feel to invite a query out loud.”

The questions of the west London year-six class, says Blake, are typical for kids of that age.

“By that age, you may have learned the fundamentals, that there are girls and boys, some people have blue eyes and a few have brown eyes and you’ve got began to see that things will change,” he says. “There’s a natural curiosity and beauty concerning the human body – children around 10 or 11 also need to know why farts smell or why our eyeballs don’t come out of our head after we sneeze.

“Year six is when children start considering what will happen. It truly is critical that earlier in primary we get it right; if we do not, boys wonder whether they’ll have periods.”

The questions children most wish to ask will change as they grow older, says Emmerson. Teenagers, aged between three and 6, have an interest within the differences between girls and boys, naming body parts, where babies come from, and family and friends.

“It’s also vital that young ones know about which areas of the body are private and shouldn’t be touched and who they may check with in the event that they are worried,” she says. “Adults have a responsibility to present this data to children … not only to attend for his or her questions.”

Seven and 8-year-olds may have more questions on growing up and the way their bodies will change, adds Emmerson. In addition they need to know about friendships and the way to regulate issues corresponding to bullying.

Pupils reaching the top of primary school could have more detailed questions for you to soak up a number of issues – including love, other forms of families, puberty, conception and the way babies develop and are born – sometimes prompted by things they’ve got read, seen on TV or the net or heard from friends.

The Sex Education Forum has produced sets of inquiries to explore with children organised by age groups.

“Within the worst schools, SRE may include one lesson about puberty in the summertime term of the last year of primary school year. That’s clearly a disgrace,” says Emmerson.

“Some schools are held back by fear about how parents will react. Yet many oldsters assume that colleges are covering these topics and are surprised and disappointed in the event that they learn how little the varsity is doing and the way late key topics together with puberty are taught.”

Blake adds: “Many oldsters do feel embarrassed about discussing these issues with their children. Parents often assume schools do greater than they do, and schools do lower than they may because they’re worried that oldsters don’t need it – this is a double-edged sword.”

Children want their parents to be their first sex educator, says Blake: “Primary school-age children trust their parents.”

He and Emmerson agree that folks and teachers both have a task to play. The Sex Education Forum has prepare some tips for fogeys.

Brook has also created a traffic light tool for professionals working with children and adolescents which helps identify, assess and respond appropriately to sexual behaviours.