My penis is very big. My wife says it hurts her when we have sex. We have sex 4 times a week. How can we stop her from hurting. We try penetrate sex?

? too long. A long penis can cause discomfort if it strikes the cervix. A wide penis should not cause a problem. Your wife may have apelic problem such as an ovarian cyst, endometriosis, pelvic inflammatory disease or inflammed bowel. Suggest she consults with a gynecologist.
Consult MD. There are many other reasons for dyspareunia (painful intercourse) besides the size of the partner. The reasons depend on her age , and general health.