जारस्त्रीदातृवेत्तारः सम्प्राप्ताः संग्रहात्ययम् ॥ कZ_०३.४.४२च्द् ॥
jāra-strī-dātṛ-vettāraḥ samprāptāḥ saṃgrahātyayam
The paramour, the woman, the giver (who arranged/handed her over), and the witness/knower are liable; the recognized ‘saṃgraha’ (lawful arrangement/maintenance-relationship) is thereby terminated/forfeited.
To deter collusion and fraudulent certification, making the surrounding network accountable—not only the couple.