You can't tell from looking at, smelling or tasting whether the food is contaminated. Obviously, if the food does look, smell or taste off, then there's something there that shouldn't be. But if it looks, smells and tastes good.. it could still make you very sick. Buy your food from a good source you can trust. Store and handle it properly and be careful with your hygiene. Wash your hands often, particularly when handling protein foods.
Many adults in their early twenties do choose to get married. However, in the world today it is more common for young adults to live as if married without actually taking the vows. So, your answer is legally recognized domestic union relationships that don't involve marriage. This is called Con-habitation.
