While it is nobody's business what another person does with their bodies, we also have to know that what others do also has a way of affecting us. Why do you think there are traffic lights and regulations for drivers? It is to prevent reckless drivers from harming others. Look at your comparisons you will find out that they are wrong too. A chicken egg that has not be sat on by a hen is a plain egg without life inside the shell but a foetus is a life growing in a womb. It is a baby unborn. Comparing plants and animals to humans is a wrong analysis.