At the time of intercourse my wife feel a pain & lubrication problem.

Painful Intercourse: I appreciate you asking this question. No one wants their partner to have a painful experience with sexual intercourse. She very easily could be entering menopause. Her vaginal tissue may be drier than you are used to and she may make less lubricating fluid in her vaginal glands. This can assessed by her gynecologist. She may be helped if you use lube while making love with her.