Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The private parts in a dream are the secret and the trust. Exposing them indicates revealing a secret and scandal. Whoever sees himself looking at another's private parts is seeking their faults.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The private parts indicate a defect in religion. Exposing them indicates falling into sin. Covering them indicates repentance.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The private parts are interpreted as a secret. Whoever sees his private parts exposed, his secret will be revealed.