My wife experiences some pain during sex almost 16 months after giving birth. I mean she'll just say "easy" when I enter, and I know what that means. Sometimes though during sex she'll say easy that hurts a little. The other night she had a little more pain than other times. She says I'm too big, but I don't really think that is the case, besides we never had this issue before the pregnancy. She did "tear" during birth, and they said it would be uncomfortable for a while during sex, but I did not think it would last this long. What do you think is going on, and it shouldn't last this long right?