Final answer:
Members in the party in Oceania are encouraged to marry within the party for loyalty.
Step-by-step explanation:
The rules regarding sex and marriage for members of the party in Oceania, as depicted in the novel 1984 by George Orwell, were that members are encouraged to marry within the party for loyalty. This can be seen when the character Winston Smith is told that sexual relations should only occur for the purpose of creating new party members and that any other form of sexual activity is discouraged.