The general consensus from research and expert opinions is that there is no one "right" frequency for how often one should have sex, as it varies greatly depending on individual libido, age, health, lifestyle, and relationship dynamics. However, several studies and experts suggest:

• Having sex about once a week is a common baseline and is associated with the greatest happiness benefits and relationship satisfaction. A study from York University with over 30,000 participants found happiness benefits plateau at once a week. Couples who have sex once a week tend to score higher in relationship and sexual satisfaction.
• Frequency tends to decrease with age: people in their 20s have sex about 80 times a year (more than once every five days), around 45-year-olds average about 60 times a year (just over once a week), and by age 65, the frequency drops to about 20 times a year (less than once every two weeks).
• Having sex more frequently than once a week is not necessarily better for overall happiness or relationship quality.
• The most important factor is mutual satisfaction and intimacy in the relationship rather than matching any specific number.
• Some couples feel happy with sex less often, even once a month, while others may have it multiple times a week; it depends on what works best for the individuals involved.

In summary, aiming for about once a week is a good general guideline for most couples, but the "right" frequency is what feels satisfying and natural for you and your partner. Prioritizing intimacy and communication matters more than hitting any specific quota.