Studies reveal that each successive decade of life increases a man’s probability of erectile dysfunction by an additional 10%. The vasodilating effects of PDE5 inhibitors like tadalafil and vardenafil increase blood flow to the penis, resulting in firmer erections, whether you have erectile dysfunction or not. But combining PDE5 inhibitors as we do in the Sexual Enhancement Protocol have demonstrated even more efficacy in improving erectile function than any one PDE5 inhibitor alone.

The Sexual Enhancement Protocol can also help you last longer. This study shows tadalafil increased intravaginal ejaculatory latency time from  2.2±1.4 min to 3.4±1.9 min with three months of daily treatment. And in this study comparing three different PDE5 inhibitors on lifelong premature ejaculators, vardenafil had the most significant effect in prolonging ejaculation latency time and penile rigidity was better.

Refractory time refers to the period between orgasm and when you feel ready to have sex again. PDE5 inhibitors like those used in the Sex Enhancement Protocol have been shown to reduce the postejaculatory refractory time in healthy men without erectile dysfunction, so you can have better sex, more often. 

Unsurprisingly, men who struggle with severe erectile dysfunction are less sexually satisfied. Research shows that PDE5 inhibitors can help change this. In this study on vardenafil, men taking the PDE5 inhibitor self-reported greater intercourse satisfaction and orgasmic function. But men taking the medication aren’t the only ones to benefit. Research indicates partners of men with erectile dysfunction are sexually dissatisfied. Yet, partners of men taking tadalafil report greater overall sexual satisfaction. In fact, in a survey of 100 heterosexual couples in which the male had clinically diagnosed erectile dysfunction, researchers found that 79.2% of the women surveyed preferred that their man take tadalafil, while only 15.6% of those women expressed a preference for Viagra.