Strenuous exercise. Alcohol. High-dose Niacin. All of these things make you go pink. All of these things are also good for your heart & circulation. As I mentioned in Red, red wine and very sharp pointy things, one glass of red wine significantly lowered my blood pressure in less than 10 minutes, probably by making my arteries dilate (which made me go pink) and by reducing my mental stress which lowered my stress hormone levels.
According to JBS2 guidelines (which I don't fully agree with), CVD risk factor increases with increasing blood pressure. It also increases with increasing TC:HDL ratio. What increases HDL? Things that make you go pink. What we now need is a study showing the effects of blushing on the risk factors for CVD!