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CONTEXT: Preadolescent friendships and early teenage dating relationships have implications for adolescent sexual initiation that may differ by race and gender. METHODS: Data on participants in th...
Context: Since the 1980s, the age at which U.S. teenagers, especially minority youth, begin having sex has decreased. There is limited information on the relationship between early sexual initiation a...
Acid phosphatase was purified from human prostatic tissue and from seminal plasma. Antisera to antigens from both sources were raised in rabbits. These antisera have been used for immunohistochemical ...
Unlike those of many mammals, rat and hamster spermatozoa do not appear to be fully activated at ejaculation. Most rat spermatozoa transported en masse to the uterus approximately 2 minutes after co...
Sperm motility is regulated by protein phosphorylation. We have shown that the signaling kinase, glycogen synthase kinase-3 (GSK-3), is present in spermatozoa. In somatic cells, GSK-3 is regulated b...
Significant attention has been focused on women’s initiation of sexual contact with men and the point at which this initiation becomes sexual aggression. The purpose of this study was to examine possi...

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