We examine the nature and predictors of social and romantic functioning in adolescents and adults with ASD. Parental reports were obtained for 25 ASD adolescents and adults (13-36 years), and 38 typical adolescents and adults (13-30 years). The ASD group relied less upon peers and friends for social (OR = 52.16, p less than 0.01) and romantic learning (OR = 38.25, p less than 0.01). Individuals with ASD were more likely to engage in inappropriate courting behaviours ([chi][squared][subscript df = 19] = 3168.74, p less than 0.001) and were more likely to focus their attention upon celebrities, strangers, colleagues, and ex-partners ([chi][squared][subscript df = 5] = 2335.40, p less than 0.001), and to pursue their target longer than controls (t = -2.23, df = 18.79, p less than 0.05). These results show that the diagnosis of ASD is pertinent when individuals are prosecuted under stalking legislation in various jurisdictions.