Tend to disappear from a relationship over time due to stress and monotony. Not only can this cause friction within a couple, but lack of amorous affection can create even more stress, further increasing emotional distance and resentment. Sex can help couples share their love and can be a coping mechanism for stress outside of the relationship.
Source: https://bengo-spellsforlove.com/lust-spell-and-sex-spells-in-australia/