If you have accumulated or inherited some degree of wealth and you are older than 35 and/or have children, you should always enter into a Pre-nupt before marrying anyone (AW, RW, whatever). It's just stupid not to. If your heart is so big that you CHOOSE to give your divorced bride 1/2 of your estate and future earnings - there is no law in the US to prevent it! If however, you are like every man I've ever known whose marriage ended poorly - you will understand very well why there should be no question here.
A well drafted PA does not take advantage of either party. In TX at least, a person is "technically" not entitled to anything their spouse owned prior to or on the date of their marriage. Afterwards they split 50/50 the "gain" in all assets (newly acquired and what was prior to the marriage). Same goes for debts unless specifically spelled out, but it gets very murky (potentially expensive in court) without documentation such as a PA. US law (and particularly Texas Family Law) is very interpretive and is usually decided by the better (often more expensive) attorney. Point is, the PA should protect both people - to be binding it must clearly state ALL the assets being protected (and if it's not listed, it's not protected) and should make provisions for the other partner (life insurance, settlements, alimony, etc.) going forward. If done correctly it's actually much more disclosure and more protection than a marriage without one for both people.