The girls selling eggs will be tested for their education level, height, blood type, or anything that can prove they have good genes.

`We usually choose girls in their 20s. At this age, they have good quality eggs,` CCTV News quoted the director of an agency specializing in providing surrogacy services as saying.

Guangdong women’s studies professor Ai Xiaoming said a lack of regulation and medical information could lead young women to sell their eggs for money.

`The fact that the human body has become a commodity is no longer new in today’s Chinese society. The business of surrogacy services cannot be banned when assisted reproductive technology becomes a part of people’s lives.

According to a medical expert at Peking University Hospital, one of the dangers is that egg sellers run the risk of not being able to get pregnant in the future.

`To retrieve eggs, a certain dose of injection is needed to stimulate the ovaries, and this can cause various levels of harm to the ovaries,` said Dr. Suen Sik-hung, a private obstetrician and gynecologist.

Dr. Suen said that in young women, a large dose of stimulant drugs can produce more than 20 eggs at a time, causing their ovaries to enlarge.

Infertility rates among women of childbearing age in mainland China increased from 3 percent two decades ago to about 15 percent in 2009, according to a report last year by People’s Daily.

Some illegal surrogacy brokers in Guangzhou offer more than $193,000 to a couple who wants a son.

China has banned surrogacy, buying and selling sperm, eggs or embryos in any form since 2001. However, medical experts say the development of the black market here shows that it is necessary to establish