Orangutans are not very territorial creatures. Orangutans are usually solitary creatures, or at least living in small groups. Males and females have their own home ranges which usually overlap, however males try and avoid overlapping home ranges with other males. Males have larger home ranges than the females, however females home ranges tend to be more stable and permanent than male ranges. Males have been know to travel to other home ranges and be aggressive towards the male that lives in that range (everyone always wants something better!). Females tend to stay and create a home range that is close to the one they grew up in, where as males will travel as far as they please to find a home range, either way the males want the range where they can access the most females. Remember since females are sexually unavailable for a number of years due to their reproduction and raising of the child the male is usually forced to move ranges to find more fertile females.
sources:
http://library.sandiegozoo.org/factsheets/orangutan/orangutan.htm#behavior
http://www.blueplanetbiomes.org/orangutan.htm
http://www.seaworld.org/animal-info/info-books/orangutan/behavior.htm
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