There are many medicines in the market like Viagra. Some examples of similar medications like Viagra are Cialis and Levitra. But these medicines are not meant to turn on your guy. Viagra or other similar medications improves your blood flow to your penis, helping you function better sexually. But for an erection, your man needs to be aroused. If he does not desire you, the medication will not work. Desire is a prerequisite for medicine to work. If he wakes up with an erection in the morning, also known as morning wood, it ensures good sexual health. The problem is psychological or maybe some pre-existing hurdles in the relationship.