My fiance is 29 years old and has no sex drive. is there anything wrong?

Maybe: I would certainly consider couples counseling during this phase of your relationship. It is important for couples to have a compatible interest in sex. He may or may not have a physical or mental issue with sex. What you consider lack of interest may be lack of lust & move on his part to a different level of the relationship. You need to find out.

Change of interest : Was there a time when he had keen interest and good performance? Does he show other signs of closeness like kissing, tight embrace and holding hands often? Does ne like to tell about his day/life or speaks little? Is he from the culture where sex is after the wedding? If he is open in communication and enjoys physical closeness, is loving and caring, asking about your concern may give answer.