Hello babyj,
Yes, pheromones work. View the main forums to see reports from people all over the world.
So we can help you with selections, can you tell us more about you, where you are from, your personality, your girlfriend, and what results you what from pheromones? This way you can get some good recommendations from the experienced users here, and you will qualify for the gift certificate.
You could also start by reading The Mens Guideand The Womens Guide