First, join an online dating site which is only for couple dating. It is impossible for couples to meet the third person for dating on ordinary dating sites, because most of people on ordinary dating sites cannot accept threesome dating, while singles on threesome dating sites are looking for couples to have threesome dating. Second, date someone in your location. Online dating sites make it possible to meet dating partners from anywhere you want. For me, having threesome dating with someone near you is better than long distance dating.