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No desire to have children
Some people want to have children, other people do not. Talk about with your partner.
If you do not want to have children, that is fine. Nobody can force you to have children. You have the right to choose. Maybe you want to have children, but you are not ready yet. You can choose when you want to have children.
If you do not (yet) have a desire to have children, use contraception during sexual intercourse.