Wetone, welcome to b2w ... it would help tremendously if you'd fill out your profile information and then share with the forum what the 2 of you have done thus far outside your monogamous marriage.
Will she role play? Will she use a dildo or vibrator in front of you to get herself off? Do you know her sexual fantasies? Will she watch porn with you or by herself? Will/has she even given someone, other than you, a BJ since you've been married? Have you even discussed this desire, you have, with her? Do you have "family" at home other than the 2 of you?