Sexual desire for your wife is different from lust.
Catechism of the Catholic Church 2362 “The acts in marriage by which the intimate and chaste union of the spouses takes place are noble and honorable; the truly human performance of these acts fosters the self-giving they signify and enriches the spouses in joy and gratitude.”145 Sexuality is a source of joy and pleasure:
The Creator himself . . . established that in the [generative] function, spouses should experience pleasure and enjoyment of body and spirit. Therefore, the spouses do nothing evil in seeking this pleasure and enjoyment. They accept what the Creator has intended for them. At the same time, spouses should know how to keep themselves within the limits of just moderation.146
Best brief book on Theology of the Body: http://www.amazon.com/Men-Women-Are-Eden-Theology/dp/0867167009
Seriously, NEVER stop telling her how gorgeous she is.
Especially when she tells you to stop, NEVER stop telling he how gorgeous she is.
SINCE you brought up the subject (normally I wouldn’t talk like this to someone about their sex life),
You SHOULD be sexually desirous of your wife.
You should NOT badger her for sex when she has a headache, cramps, 8 months pregnant, etc.,
If you cannot be with your wife, you should not allow your desires for her to drive you to illicit substitutes.
You should not engage in sexual acts which are demeaning, selfishly gratifying or disordered.
If, for some exceptional reason, you need to avoid pregnancy, you should not use contraception, but avoid fertile times, and even abstain if the need to avoid pregnancy is grave enough.