Many Fleshlights feature adjustable end caps that allow you to control the suction and tightness during use, providing a customizable experience tailored to your preferences. Customization is important because it allows you to experiment with different sensations and intensities, ensuring that your Fleshlight experience is as enjoyable and satisfying as possible. By adjusting the tightness and suction, you can create a more personalized experience that caters to your unique desires.