• The Journal of Korean Medicine
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• v.20 no.1 s.37
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• pp.22-29
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• 1999

To evaluate the effect of Choakwiyeum water extract on the male reproductive functions, experiments were performed on male rats. The results obtained were as follows: 1. Intromission frequency was increased significantly after the administration of Choakwiyeum water extract in male rats. 2. Intromission latency was increased significantly after the administration of Choakwiyeum water extract and ketoconazole in male rats. 3. Mount frequency was increased significantly after the administration of Cboakwiyeum water extract and TCDD in male rats. 4. Serum testosterone concentration was increased significantly after the administration of Choakwiyeum water extract in male rats. 5. Serum testosterone concentration was increased significantly after the administration of Choakwiyeum water extract and ketoconazole in male rats.

• YAKHAK HOEJI
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• v.49 no.6
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• pp.471-476
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• 2005

Rhus verniciflua Stokes (RVS) has been used as a food supplement and a traditional herbal medicine for a men's sexual enhancement. In this study, we prepared a flavonoid fraction (RWE) from a hot water extract of RVS and its influence on sexual behavior was studied in male rats which were orally administered varying doses of RWE for 2 weeks. All doses of RWE stimulated sexual behavior in male rats such as reducing mounting latency and enhancing mount frequencies. However, intermission numbers were not changed and none of group can observe the ejaculation during behavioral testing time 5 min. Testosterone levels were Increased about 0$\∼$53$\%$ and 92$\∼$164$\%$ by the treatment of RWE for 1 and 2 weeks, respectively. However, estrogen levels in male rats tended to decrease in a dose dependent manner of RWE. At the dose of RWE 200 mg/kg, estrogen level was reduced to 77.5$\%$ and 70.3$\%$ of control after 1 and 2 weeks treatment. These findings suggest that the Rhus flavonoid fraction can stimulate the androgen-dependent male sexual behavior and it can be applied to the material of functional food for enhancing the sexual function.

• Interdisciplinary Bio Central
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• v.3 no.4
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• pp.13.1-13.8
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• 2011

Previous research has established the existence of individual differences with regards to individuals' optimum time of well-functioning; specifically in terms of being either morning or evening oriented. An association has also emerged between being more evening, as opposed to morning, oriented and having a greater number of sexual partners. The aim of the present study was to investigate whether "eveningness" in males is an evolved sexually dimorphic trait consistent across different cultures. A sample of 179 male Sri Lankan men residing in two different cultural and economic settings, Italy and Sri Lanka, were administered the Morningness-Eveningness Questionnaire (MEQ) followed by assessing their sexual behavior history. The results robustly portrayed a highly significant main effect of MEQ types highlighting the twofold sexual success enjoyed by the evening individuals in both regional locations. Morning oriented individuals, showed a stronger preference for going out and partying than evening-types, suggesting that the higher mating success of evening types is not due to their different lifestyles allowing more opportunities to encounter females. However, evening types exhibited a preference for flirtatious behaviors in the later part of the day. Shoulder-to-hip and handgrip strength, as measures of testosterone levels, were not significantly associated with eveningness. The results are discussed in terms of sexual selection and its interplay with human cultural variation.