We have spoken in the past about the benefits of a prenuptial agreement. It allows a couple to discuss each's wishes when it comes to many aspects of the marriage during happier times when it is more likely that a couple will work with one another to assure that both sides are happy when it comes to things like property division. When you discuss these things while under good terms, you will prevent allowing animosity or negative emotions affect the decisions you make.
This is good for two reasons. First, it makes for truer decisions to be made. The decisions will not be influenced by negative emotions. It also means that these decisions were pre-decided, so it is one less thing you need to worry about if a marriage does happen to go south.
Prenuptial agreements can also be used to help guide a couple and make decisions regarding how the marriage is to operate, including but not limited to who takes care of finances, and how the finances are divided up between the two spouses, bills, investments and savings, accounts, etc. It can also be used to put on paper the tasks of each spouse. When everyone is on the same page, in this instance quite literally, then there can be no confusion or arguments over who needs to take care of what, and when it needs to be taken care of.
Although a prenuptial agreement can be drafted without professional help, there are certain factors that might nullify the entire document. It may be wise to have it looked at by a legal professional to make sure the document would hold up in court.