Lesbian koalas and gay male orangutans going at it, bisexual dolphins, the albatross eggs that have two mommies … Animal researchers are now documenting same-sex behavior which had been overlooked or explained away for 150 years. Activists, both gay and conservative, try to use this research for their own ends. But does the idea of gay animals even make sense? As one researcher puts it, “‘lesbian’ is a human term.”