Among the Clan, there exists a hand sign that only men can make and only women can receive, instructing the female in question to present for sexual intercourse. Any man of the Clan (a male who has made his first hunting kill) may give this instruction to any woman of the Clan (a female who has passed menarche), should he feel the need to "relieve his needs," regardless of marital status. (The female's state of arousal is never addressed directly, but since Clan women are able to flirt with men using seductive and inviting body language, enjoyment of the act is not unknown.) Because the Clan believes babies are created by the Totems and have no concept of any connection between copulation and conception, lines of descent are matrilineal, but any children a man's mate bears are considered his heirs (especially in regards to the son of the leader's mate becoming the future leader), and he is expected to provide for her family and train her sons to hunt. Who is mated to whom is decided solely by the men, though wise leaders do of course take the prospective bride's feelings into account; the few Clans depicted average less than fifty members, and even one discordant pairing can cause trouble.