Hu runs her office in Shenzhen, South China's Guangdong province, providing sex education classes to children between 6 and 13 years old, with different content according to their age.

"Young Chinese parents are more open to sex, but their method of imparting sex education sometimes leads the children astray," Hu told China Daily.

"The problem of sex education in China is not about a dearth of knowledge, but a lack of proper methods to spread the knowledge. Professional sex educationists in China are not up to the mark," she said.

"Sexual education should begin when your baby is born. The first class should teach them to respect their body," Hu said.

For example, children younger than 4 should learn the body's differences visually, which could satisfy their sexual psychological development, she said.

However, she also pointed out that sex education at the wrong age could provoke in young minds unbridled interest in sexual matters, resulting in increased and experimental sexual activity.

A recent China Youth News survey found that sexual issues often perturbed almost 73 percent of the respondents, and nearly 80 percent turned to the Internet for answers. Other favorite sources were books, friends and the media.