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Characters
You can have up to 9 characters at any one time; if you wish to have more, existing characters must be removed. Once you have created your initial character or activated a character, you can return back to the initial state by choosing Options from the HUD dialog to create additional characters or assume the identity of an existing birth.
Aging
There are four stages of aging: Child, Adolescence, Young Adult, Adult. Fertility begins sometime during the Adolescence period. Aging is based on species (different for each species) number of days till you are considered a full adult. You are able to fully use the HUD at any of these stages.
You actually hold onto compatibility permanently when copulating during your early stages
Copulation
Copulation is also known as intercourse, which can be engaged from either using the region search or the quick breed button to find others nearby. Copulation requires the other individual to accept the request unless they have public mode engaged, their defense or conscious stat is too low to decline, or they have the initiator whitelisted to auto-approve. Once engaged into copulation, the initiator is provided a dialog with stories to choose how they wish to have intercourse with the individual; the stories listed can change depending on one or more criteria which can include anything from your gender to your copulation partner's species (the list of factors for each story will be provided in the future).