We have a number of basic instincts as human beings and in order to remain healthy and happy we need to feel satisfied from time to time. For example when we feel hungry we must consume food and when we feel thirsty we must drink water. When we feel the urge if these needs are not met then it could lead to various problems like malnutrition and dehydration. Similarly there is also a basic instinct to get engaged in a sexual intercourse in order to advance procreation. However even when humans do not want to reproduce they still want to