From experience, running adult mobile ads in Europe works best during the late evening and early morning hours. Most users are more active after work or just before going to bed. This usually falls between 9 PM and 2 AM in their local time. Weekends also tend to give better results because people are more relaxed and spend more time browsing. During work hours or early mornings, performance is often weaker since people are busy or not in the right mood for such content. It's also good to test different days of the week because what works well in one country might perform less in another. Try small campaigns to see how traffic behaves based on time, then increase your spend on the hours that give the best returns. How does your ad performance change when you run them at different hours in different European countries?