I am 30 and finding it hard to get stiff and long elections. Dr suggested me Penile Colour Doppler. However 30 mg of Papaverine injection had no effect. I didn't had any erection even until 30 minutes. What could be the reason. I am really tensed as I do get early morning elections or elections during masturbatinng consumed tadalafil 10 mg later in the night and found it effective in erection. Do I need to get aroused by rubbing etc? Plz reply as I am tensed.