Christina, 25, told Cosmopolitan magazine: "We have naked Sundays. You just lie in bed all day and chill with each other and do things that husbands and wives do. We love our cosiness."
The 'Dirrty' singer also divulged that she and Jordan, 29, cook together to help keep the closeness in their marriage.
The couple's joint speciality dish is spicy Mexican tacos.
Christina said: "We have our taco night. He cooks the meat and I chop the tomatoes and the lettuce. It's important to take time for your spouse and nurture the relationship."