The invention relates to enhancing a human sexual activity. The inventive means for enhancing a human sexual activity is embodied in the form of a light water containing at least 99.739 molecular % or at least 99.760 molecular % or at least 99.774 molecular % of the lighter 1H216O molecules and up to 100% the other forms of water molecules. The inventive method for enhancing a human sexual activity consists in administrating to a treatable person an effective quantity of the light water containing at least 99.739 molecular % or at least 99.760 molecular % or at least 99.774 molecular % of the lighter 1H216O molecules and up to 100% the other forms of water molecules. In the preferred embodiment of the method, an effective quantity of the light water containing at least 99.739 molecular % or at least 99.760 molecular % or at least 99.774 molecular % of the lighter 1H216O molecules and up to 100% the other forms of water molecules is administrated orally or parenterally. The method can also consists in additionally administrating to a treatable person an effective amount of the preparation for enhancing a human sexual activity, which is selected from the following medicinal means: a homeopathic agent, a physiotherapeutic agent, a psychotherapeutic agent, a nutritional agent, a vitamin-mineral additive, a biologically active additive of the mixture thereof.