Is ok to lick my wife vagina?

This is commonly: done to enhance pleasure. It is called Cunnilingus. There is usually no medical prohibition from engaging in Cunnilingus.

Yes: It is okay and it is okay for her to lick your penis. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.