Some couples feels, sex three times a week is cool for them and it help maintain a good sex life for them. For some others, once a month is just ideal for them and they think they good with that.
We are not the same. Couples are different from each other and the way at which they handle their sex life good and the best to them. Any other way might really not appeal to them than the way they handle theirs.
Every couple carries different set of emotional needs that can not be considered in any other relationship.
A good, strong and healthy sex life is finding what works for the two of you. But, the mistake couples make is that, they fail to understand the changes that occur with our feelings and emotions. Both of you might like once a week but our feelings for each other grows and once a week might not work anymore but three times a week
You both must find what works and be open to changes that may come up along the way.