How do you call a person who takes part in an activity for love of it and not to make money?

We know what ruthless means but what does Ruth mean? How do you start a conversation with your ex to get her back? Who or what is the key person or founder for polygamy? When a friend has another best friend. What should you do? What are Stephanie rice family names? What should I do about an Ex-wife who after 10 years still keeps showing up at family relation functions claiming she was invited and is now dragging along her new husband? Is it wrong to date your bffs twin bro? What is the full form of girl friend? What do you do when you are in a good relationship and in love but then someone you have feelings for comes back into your life and claims to like you? Are Sonny and Chad going to go back together? Which day is for sons-in-law to pay respect to their parents-in-law? What was the punishment for adultery in middle ages? What is the relationship to son-in-law's daughter from a previous marriage? Who is more jealous men or women? Does a married man care about his mistress if its long term relationship? Your husband cheated once can you trust him again? What does it mean when he doesn't call as he promised he would? Is jealousy an emotion? Where should you go on a first date this weekend? Is a shortstop more like an outfielder than like a quarterback?