Perform wudu when you touch your private parts.

The Prophet Muhammad (peace be upon him) taught that it is necessary to perform ablution after touching one's penis. This means that if a person touches their private parts, they must wash their hands and face with water, and then rinse their mouth and nose with water. They must also wash each arm up to the elbows three times, and wipe over their head once. Finally, they must wash each foot up to the ankles three times. This ritual of ablution is known as wudu in Arabic, which helps purify a person spiritually before prayer or other acts of worship. It also serves as a reminder for people not to touch themselves inappropriately or engage in any immoral activities that would require them to cleanse themselves afterwards.