Oxygen is adding two reality skeins to its development slate.“Teen Weddings” will examine the ups and downs young couples endure on the way to the altar. Show will be exec produced by Lisa Levenson, Simon Lloyd and Joe Houlihan. “Thrift Wars” looks at Gotham’s frugal shoppers who hunt for the city’s hottest vintage clothing and accessories, and then try to make a profit by reselling them. Matt Sharp will exec produce. NBCUniversal cabler anticipates several timeslots available this year and there are several shows in development that are vying for series orders. “Teen Weddings” and “Thrift Wars” are the first shows in development announced since the net hired senior programming and development VP Rod Aissa from OWN. He reports to Oxygen prexy Jason Klarman.