“…Earlier maturation in girls has been linked to disorders of the family as a unit (Ellis, McFadyen-Ketchum, et aI., 1999). Some investigators have noted the acceptance or pursuit of risk, such as sexual or combative risk, the display of social dominance, or any of a range of other be-havioral dysfunctions (Rubin, Reinisch, et al, 1981;Udry and Cliquet, 1982;Sandler, Wilcox, et al, 1984;Westney, Jenkins, et al, 1984;Udry, Billy, et al, 1985;Warren and Brooks-Gunn, 1989;Helm and Lidegaard, 1990;Udry, 1990;Constant, Abrams, et al, 1993;Flannery, Rowe, et al, 1993;Halpern, Udry, et al, 1993Orr and Ingersoll, 1995;Schaal, Tremblay, et al, 1996;Larsen and Kragstrup, 1997;Laitinen-Krispijn, van der Ende, et al, 1999a;Otor and Pandey, 1999;Rieder and Coupey, 1999;Magnusson, 2001). In a large survey of 17-year-old Swedish girls, those reporting sexual debut-coitarche-before age 15 were compared to those debuting later; the first group was about twice as likely to report menarche at age 11 or earlier, as well as perceived social age exceeding chronological age by 2 years or more.…”