منابع مشابه
[The onset of sexual activity in male adolescents].
This quantitative study aimed to investigate the onset of sexual activity in male adolescents from Concordia, Santa Catarina, Brazil. The studied sample consisted of a total of 340 14-19-year-old male adolescents attending secondary school in six local educational institutions, who accepted to answer the questionnaire and whose parents signed the Free and Informed Consent. From these, 69.7% aff...
متن کاملEffect of prenatal immobilization stress on sexual activity in male Wistar rats
Since the stress influences the biological processes, in the present study the effect of prenatal immobilization stress on the sexual activity of male rats was studied. Adult male and female Wistar rats (Pasteur Institute, Tehran) were copulated. After observing the vaginal plugs, pregnant rats were divided into control and two experimental groups. All groups were kept under the laboratory co...
متن کاملSexual Selection: Male-Male Competition
Aggression. Offensive action, particularly in regard to defending resources. Aggression in defending females and other resources should be favored by selection when there are fewer resources than competitors and when an individual can boost fitness by forcibly removing another individual. Intersexual Selection. Sexual selection due to interactions between the sexes. Mate choice by males or fema...
متن کاملIncreased sexual activity reduces male immune function in Drosophila melanogaster.
Despite the benefits of resistance, susceptibility to infectious disease is commonplace. Although specific susceptibility may be considered an inevitable consequence of the co-evolutionary arms race between parasite and host, a more general constraint may arise from the cost of an immune response. This "cost" hypothesis predicts a tradeoff between immune defense and other components of fitness....
متن کاملSubstance Use and the Number of Male Sexual Partners by African American and Puerto Rican Women
Background In the United States (US), there are 19 million new sexually transmitted disease (STD) infections each year. Untreated STDs can lead to serious long-term adverse health consequences, especially for young women. Centers for Disease Control and Prevention estimates that undiagnosed and untreated STDs cause at least 24,000 women in the US each year to become infertile. This clearly is a...
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ژورنال
عنوان ژورنال: Nippon Ronen Igakkai Zasshi. Japanese Journal of Geriatrics
سال: 1992
ISSN: 0300-9173
DOI: 10.3143/geriatrics.29.350