I tried Yohimbe extract liquid with B-12. You put it under your tounge about an hour before you have sex.
It works. It seems to expand the bloodvessles in your dick. I got tired before it wore off.
The only thing I didn't like was that I woke up in the middle of the night with my skin-crawling. It was very uncomfortable.
A buddy of mine said to drink more water next time.