The only thing is though... even within a marriage, and it sounds like your wife may be victim to this--an "insatiable" sex drive can also mean it's primary foundation is still lust, not love or God's intentions, even if you're married.
I surely can't speak as an expert, but I would suggest that maybe you and your wife seek out counseling, because in my own observations... this kind of craving for sex, even within marriage, goes beyond normal desires intended by God--it signals the roots of, or hints at, a full-blown addiction that will not be able to be contained within the marriage and will eventually look to outside sources to fuel the constant need for something "more adventurous", which doesn't have to mean other people, but maybe such things as pornography... and you will surely be pulled right into it.
And yes, I agree with everyone else... please spare the chickens... and goats... and pigs. Not only will it be undefiled sex, but PETA-approved as well!