Something in red wine helps rats have erections, according to researchers at Osaka University.Although it is still unclear whether a similar effect would be felt by humans and while the research does not prove that red wine itself helps overcome erectile dysfunction (ED), the discovery may be a step forward for impotence research.Resveratrol, a type of polyphenol found in red wines, appeared to increase blood flow to the rats' penises by promoting the production of nitrogen monoxide, which widens blood vessels.