Answer:
A prenuptial agreement
Step-by-step explanation:
A prenuptial agreement (prenup) is signed between two people that wish to get married but also wish to establish property rights in order to protect their personal assets.
It is not only used by wealthy men that wish to protect their riches from gold digging wives. It can be used by working couples that include man/woman, man/man or woman/woman relationships. And many times it is also used by wealthy women who wish to protect their riches from gold digging husbands. In western countries women and men are equal.
A prenup not only protects accumulated funds, but it also can include how retirement or education funds will be distributed, and the interests of children from previous relationships.