Hard to say. but certainly by the 1400's AD

http://en.wikipedia.org/wiki/Condom

"In Asia before the fifteenth century, some use of glans condoms (devices covering only the head of the penis) is recorded. Condoms seem to have been used for contraception, and to have been known only by members of the upper classes. In China, glans condoms may have been made of oiled silk paper, or of lamb intestines. In Japan, they were made of tortoise shell or animal horn."
Source(s):
http://en.wikipedia.org/wiki/Condom


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