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A successful relationship relies on several other factors as well such as common interests, communication, compromise, and growth as individuals and as a couple
People have different ideas of what's important in a relationship.
There are different types of relationships, and how important sex is for a relationship is determined by the participants in the relationship.
While it can help and improve a relationship it should not be felt as an obligation.
Sex is also important out of relationships, sex is important to many people in general.
Intimate relationship with attraction as an important factor flourishes through sex as the medium to intimacy.
Defining both the subject of "Sex", its descriptor "Important", and the term "relationships" adds context to the claim that "sex is important".
The absence of sex is also important in relationships, such as platonic relationships or when younger kids go out.
It is the biological imperative behind all human interaction.
In most relationships (while I understand 'relationship' here in a partner sense) this makes one of the most important differences between 'friendship' and 'partnership'. Also the opposite would make reproduction a lot harder (while of course not every relationship must lead to reproduction).
Not for A-sexuals.