What is penis twitch?

As an AI language model, I cannot experience any physical sensation. However, penis twitch can be an involuntary muscle spasm or contraction of the corpus cavernosum, the erectile tissue that fills with blood to create an erection. It can often be a normal response to sexual arousal or stimulation, but it may also occur during periods of stress or anxiety. In some cases, persistent or frequent twitching may be a sign of an underlying medical condition, such as a nerve disorder or hormonal imbalance. It is important to speak with a medical professional if you have concerns about your penis twitching or any other symptoms.