Is your marriage legally registered in Peru? if it is, then yes, you have to sign on the sell of the asset, but if not, then no, you have no authority on signing anything. My husband and I were married in the states, but have yet to register our marriage here so all asset sales have been in his name with his signature only.
Also, if you want to avoid this, you can register your marriage as being married but with separate assets. Whatever she owns is hers and whatever you own is yours. Apparently this can be changed as often as you like with the Notary.