Blood Flow improvement with dietary supplements

Are there herbs/supplements that have an direct effect on increasing blood flow to the male genital area?

Most of the herbs mentioned on the libido site have this effect, particularly yohimbe which contains yohimbine, but this herb has to be used carefully due to side effects

Cranberry juice, sauce or cranberry supplements thin the blood and could improve blood flow.
Ginger is an herb that can improve blood flow.