Fan in the bathroom

One thing that has perplexed me often, and has rose in my wish list for my own house, is that why people don't have fans in the bathroom/toilet. A person spends about half-an-hour of his day doing morning rituals and given India's weather, place can become very hot and sweaty at times. Couple this with the fact that close confine and moisture actually make matter worse. Many a times, specially in summer, one comes out of bathroom worse than what s/he went in. While the need is abundantly clear, absence of attempts to fulfill is surprising. In fact, people find this notion laughable. If you do too, prey (or is it pray?), tell me why?