When did homosexuality originate?

Homosexual behavior has been observed in just about every animal species, and humans are no exception. Probably 80 % of us are capable of homosexual intercourse, even if we don't actually do it. It's estimated that from 2 to 3 % of us are exclusively or primarily homosexual, and this appears to be true in all human societies that have been examined.

The idea that homosexuals were a different "type" of person emerged in Germany in the 19th century.