I have no problem wiht prenups with "IFS" involved with the wording of all of it...
examples: (and i'll use the man as the example of the one with the money, although it could work either direction)
say that a prenup says the wife gets nothing that the husband had prior to the marriage in the prenup... this should be IF he is faithful and non abusive until the end!!
IF she cheats on him and is the one that wants the marriage to end. she shouldn't get anything!
but say the wife has been nothing but faithful and caring, and always a good wife, and the hubby's future wife is just being born..... screw that, there should be an *IF* to cover the not so wealthy party in this case. he decides he wants out for the reason of some young thing, he should have to pay for it dearly!!
i don't know if a standard prenup is normally set with conditions, but it should be. and anyone with widely varied assets or incomes should have one.... (marrying a golddigger for example) but as long as the marriage is for love, the person WANTING out should have to pay. if it's solely irreconciliable differences (no cheating or abuse) then what you brought in, you take out.