Given the task definition and input, reply with output. In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

(CNN) Want to have a more affectionate relationship with your life partner? Carve out time to have more sex. That's the takeaway of a series of four studies of committed couples in both the United States and Switzerland. "Sex makes you feel good, not just because it releases more hormones or endorphins but also because you will feel more affection with your partner," said clinical psychologist Anik Debrot of the University of Lausanne in Switzerland, lead author of one of the studies. "It doesn't matter if you're a man or a woman, affection is a very important reason that sex feels good to you."More sex leads to increased affection in committed relationships, says studyErotic moments were as valuable as intercourseCouples who want healthy relationships should make time for sex, experts say 
 Question:"_ should preserve some quality time for this to happen."

Couples