In the 1920s, a German anthropologist named Kurt Falk published his research on African tribes, which included some acceptance of homosexuality and bisexuality. Falk reported that homosexual and cross-dressing practices were commonplace among the Ovimbundu people. Ovimbundu men who behave, act and dress as women are known as or , and historically would marry other men. Similar individuals exist in neighbouring ethnic groups; they are known as among the Ambundu, among the Kongo and among the Lovale people. Same-sex sexual acts were regarded as having medical effects in these societies. Indeed, such acts were viewed as a remedy for impotence, to improve soil fertility or as a transfer of knowledge. Sexual practices between men were also part of initiation rituals.