DO NOT base major relationship decisions on what you think a bunch of other guys find important.
Also, these types of agreements don't just benefit one party, they are most useful when both people involved look at the legalities of their particular situation and both think "Hmm, the default laws really don't apply fairly to our situation".
It's always a good idea to familiarize yourself with whatever laws apply to whatever situation you are in, not just in terms of relationships, that's just a good idea overall. So yes, look into what laws apply to your situation and plan accordingly *with your partner* if you guys aren't happy with the implications of those laws.
If you are just looking at this as a means to somehow "protect yourself", then you are off to a very bad start.