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From chinadaily.com.cn: "A man shows a bottle of newly-developed liquid condom for women use he bought from a drugstore in Yichang, Hubei Province November 21, 2005. The new product, making use of naometer and physical tiny foaming technologies, is said to be easy to apply, anti-bacteria and  lubricating. The invisible condom, developed by a company in south China's Guangdong Province, has won approval from the province's drug administration and is now available in drugstores in the country."

 TheRegister.com has few more details: 

 "Dubbed the Nanometer-silver Cryptomorphic Condom (NCC), it's designed for female rather than male usage. The condom-in-a-can is essentially an antiseptic foam spray that the manufacturer claims forms a physical membrane inside the vagina, protecting it from infection, acting as a barrier to pregnancy and providing a lubricating effect.

It's not known who makes the NCC, but Beijing-based Chinese-Canadian condom maker Blue Cross Biomedical has been touting something along these lines for a while now. It maintains its spray-in condom "can effectively kill gynaecological disease pathogens such as staphylococcus aureus, Candida, coliform bacillus, and can prevent sexually transmitted diseases.

"It can remain in the vagina for a long time without destroying the vagina's chemical balance," the company adds. "Daily use of this product can help maintain genital hygiene and prevent infection by pathogens".