स यामिच्छेत् कामयेत मेति तस्यामर्थं निष्ठाय मुखेन मुखं संधायोपस्थमस्या अभिमृश्य जपेत् अङ्गादङ्गात्संभवसि हृदयादधिजायसे ।स त्वमङ्गकषायोऽसि दिग्धविद्धामिव मादयेमाममूं मयीति ॥६,४.९ ॥
In plain words
He who wishes, "May she love me" — having united with her, having joined mouth to mouth and stroked her lap, let him murmur: "Thou art born from every limb; from the heart thou art brought forth. Thou art the very essence of the limbs. Madden this woman here toward me, as one pierced by a poisoned arrow."
The commentators
Bṛhadāraṇyakopaniṣadbhāṣyam· bhāṣya
स यां स्वभार्यामिच्छेत्- इयं मां कामयेतेति, तस्याम् अर्थं प्रजननेन्द्रियम् निष्ठाय निक्षिप्य, मुखेन मुखं संधाय, उपस्थमस्या अभिमृश्य, जपेदिमं मन्त्रम्- 'अङ्गादङ्गात्' इति ॥
In plain words
If it is his own wife he wants to love him, he enters her — his organ of generation placed within her — mouth pressed to mouth, touching her secret place, and murmurs this same mantra: 'From every limb...'
Close to the Sanskrit
If he should desire his own wife — [wishing] 'let this woman love me' — having placed, that is inserted, his organ of generation within her, having joined mouth to mouth, and having touched her private part, he should murmur this mantra: 'From every limb...'