(http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=10706169&dopt=AbstractPlus)
Halpern CT, Joyner K, Udry JR, Suchindran C.
University of North Carolina at Chapel Hill, USA.

PURPOSE: To examine the relationship between an intelligence measure and a wide spectrum of partnered sexual activity ranging from holding hands to sexual intercourse among adolescents. 阅读全文 »