Paul described those bounds at 1 Corinthians 7: 2 - 5. Sexual relations with her husband become the exclusive privilege of the wife; he likewise has the same privilege with her alone.
عَلَى نَحْوٍ مُشَابِهٍ ،‏ لَا يَجِدُ ٱلْمُتَزَوِّجُونَ ٱلْحِمَايَةَ مِنَ ٱلْفَسَادِ ٱلْأَدَبِيِّ مَا لَمْ يَبْقَوْا ضِمْنَ ٱلْحُدُودِ ٱلَّتِي رَسَمَهَا مُنْشِئُ ٱلزَّوَاجِ بِشَأْنِ ٱلْعَلَاقَاتِ ٱلْجِنْسِيَّةِ .‏