Abstract: Provided herein are devices, systems, and methods configured to alleviate erectile dysfunction by preventing outwards blood flow away from the penis while allowing inward blood flow into the penis to aid in erection initiation, maintenance, and stamina. The geometry, configuration, flexibility, and pliability of the device enable its use on flaccid or erect penises. The penile constriction device and band enables the system to apply an adjustable compressive force on a flaccid or an erect penis.