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Since your wife has pain during intercourse
it needs to be investigated to find the reason of pain.If she has had normal delivery then vagina gets slightly lax so there should be usually no pain and if there was LSCS delivery then vagina remains normal.If she did not have pain before it is necessary to see why she has pain now so get her examined internally by a Gynaecologist.Also discuss the issue with your wife and if she says that due to pain she does not enjoy sex then either you use K-Y jelly
for lubrication and even if after good lubrication she has pain then you can even use a local anaesthetic
after consulting her Gynaecologist.