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Do abdominal exercises. This will help your abdominal muscles support and hold your erection, as opposed to holding your belly. Furthermore, if you have a large gut, it tends to make your unit small by comparison.

Being in shape and having a good physique will make you feel good about yourself and up your confidence. This will, in turn, make you comfortable with your body, enticing you to have sex and increasing your sex drive.

You can also give your penis a workout with some kegel exercises. While there's no hard evidence that they will produce a larger size, they will help you stay hard longer.