Does the less blood circulation in our body cause premature ejaculation?

No... Premature ejaculation is nothing to do with poor circulation. In fact, you have had good circulation that is why you've grown and matured with ability to have erection ; intercourse to fulfill baby-making and sex-enjoying. But premature ejaculation (ejaculate within 1 minute after penetration) happens to some 20-30% of men although average time to ejaculation is about 5-10 minutes. But its rx avai.