Sheikh Muhammad al-Manî`î, professor at Umm al-Qurâ University
One of the objectives of marriage is to preserve chastity by minimizing the tendency to commit adultery.
The Prophet (peace be upon him) encouraged us to marry. Therefore, your relationship with your wife is part of obedience to Allah, and it is a charity for the two spouses to indulge in their relationship with one another, because they are, in fact, preserving their chastity and hence their religion, and they are satisfying each other's desires in a lawful manner.
The Prophet (peace be upon him) said: “Your approach to your wife is a charity.”
They (the Companions) said: “O Messenger of Allah, we are fulfilling our own desire and we deserve a reward?”
He said: “If a person fulfills his desires unlawfully, is he not deserving of punishment? Thus, if he does so lawfully, he deserves a reward.” [Sahîh Muslim ]
And Allah knows best.
Source: Islam Today