Yes, a male masturbation egg can be an effective tool for practicing stamina training or addressing premature ejaculation. By using the egg regularly and focusing on controlling your arousal levels, you can develop a better understanding of your body's responses and learn to delay ejaculation. Some men also find it helpful to practice the "stop-start" technique or "edging" while using a jerking off egg, which involves stopping stimulation just before the point of ejaculation and then resuming once the urge has subsided.