[Solved] If no unique identifier is available for an entity, you can go without one. Homosexual Behavior: Sexual or romantic activities and attractions between individuals of the same sex or gender identity. Estrogen: A group of sex hormones crucial for the development and functioning of female reproductive tissues, and also involved in various other body processes. Testosterone: A steroid hormone that is the primary male sex hormone, responsible for the development of male secondary sexual characteristics. Pornography: Material designed to stimulate sexual excitement through the depiction of sexual activities or content.