Definitions for "Alternative lifestyle"
a mode or style of conducting one's life that is considerably removed from the generally perceived norm
This term is used to refer to the way of life/play that a large number of dominant and submissive people practice all over the world. Due to the attractive advantages of this lifestyle, the number of self-identified practitioners is growing every day. I look forward to the day when D/s is referred to simply as a lifestyle.
A mode or style of life that one chooses to conduct their life. Most often it is a lifestyle that is not perceived as the cultural "norm". A few examples would be Swinging, BDSM and Homosexuality. Although Homosexuality as become more of an eccepted variant of the mainstream.