Am I being controlling and/or can you help me convince my wife to stop a very annoying waldrobe malfuction?

It seems like no matter what type of pants my wife wears her butt crack always peaks just over the top. This has been going on for the past 8½ years. It’s become almost a joke. I tell her to cover her ass and she laughs and says, “I know you love it.” I don’t. I HATE it. It happens in public and at family functions. At times, when we are at home, I can see her whole ass coming out of her pants. I have been dealing with this for a long time now and I would like it to stop.

She says she hides it at work so I know that her pants can cover up her ass. What can I do? What can I say? I really do not like it and she seems to know it.

Any suggestions or advice? Any behavior modification techniques that I might try?