Since ED is multifactorial, many physicians rely solely on phosphodiesterase-5 (PDE-5) inhibitors to increase blood flow to the arteries to maintain an erection. Although it works in many patients, some patients can get overly anxious prior to sexual intercourse and not be able to produce or maintain an erection. While some patients may realize that DSB may improve their anxiety they don't know how to perform DSB properly. We hypothesize that by providing software interactivity on deep and slow breathing to this group of ED patients, may in turn help reduce their anxiety, thus, maximize the effect of PDE5 inhibitors. The app called "Serenita" for mobile phones, designed by Eco-Fusion will be utilized in this study. The app performs two functions: it detects stress and focus level and It guides the user through a personalized breathing exercise designed to reduce stress and increase focus. Breathing as a method to treat stress has three scientifically validated variations, the deep diaphragmatic breathing, used for centuries as part of Yoga which often refers as Yogic breathing, biofeedback breathing, a method in which the user sees in real-time how his breathing affects his stress level, and coherence breathing, a method that synchronizes breathing pace with heart rhythms. The technology embedded in Serenita app combines all three methods into a personalized guided breathing regimen. The app acquires data by turning the mobile phone's camera into a biomedical sensor which peers into a person's blood stream, obtaining heart rate, heart rate variability and breathing pace. Then the app processes the data obtained to assess user's stress and focus level.