Seriously, just sign the prenup if he wants it. If he doesn't then don't. My only real argument against them is that I have a violent allergic reaction to giving any any lawyer any money. My divorce was trivial, both parties civil and it still cost a few thousand $.
I left my ex the house, btw. No prenup and a completely equitable split, tho my female friends said I should take alimony. My response? "Why? I have my own career?". "He makes more $ b/c he got to invest in his career when you stayed home." "So? I have an awesome child--I'm smart and my career is ramping up quite nicely."
So my real advice to any woman is: don't sacrifice your education to be a homemaker. At some point, you will want to get into the workforce, not as a hedge for divorce, but so you can have interests outside of the home once your kids are older. Same advice for men who stay home, btw.
My SO wants to marry. He hasn't mentioned a prenup but I'm for it. Really, when you each make each other the beneficiary of your insurance, then isn't arguing against a prenup essentially saying you are hedging your bets *against* 'till death do we part'?
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh