Dating is a stage of romantic and/or sexual relationships in humans whereby two or more people meet socially, possibly as friends or with the aim of each assessing the other's suitability as a partner in a more committed intimate relationship or marriage. It can be a form of courtship consisting of social activities done by the couple. The protocols and practices of dating, and the terms used to describe it, vary considerably from country to country and over time. While the term has several meanings, the most frequent usage refers to two or more people exploring whether they are romantically and/or sexually compatible by participating in dates with the other. With the use of modern technology, people can date via telephone or computer or meet in person. This term may also refer to two or more people who have already decided they share romantic and/or sexual feelings toward each other. These people will have dates on a regular basis, and they may or may not be having sexual relations. This period of courtship is sometimes seen as a precursor to engagement or marriage. Some religions require people to wait until a certain age to begin dating, which has been a source of controversy.