To dream about being part of harem indicates a feeling of suppression and denial of one's own sexual desires. Being held prisoner by a harem reflects a struggle with your own sexuality and an attempt to be accepted despite culture biases.
In older times, owning a harem was a sign of wealth and power. Similarly, to dream about keeping a harem refers to a waste of time, energy, or money on trivial matters.
Harems in Arabian culture are always attached with women's sexuality and male's domination over them as he was their one and only guardian. For many years, women are utilized for entertainment and fulfillment of sexual desires. Even though this reality has changed, harems are still part of the memories of women. Such precipitated ideas are manifested through dreams.