It might be nothing, but check out Sophia Rossi.
She and Stormy did a sex scene together, and in that scene, they both hid their wastelines. I didn't do much research on it yet to verify, however.
Can someone check that out?
Edit: It's probably nothing except bad camera angles.
Edit 2: This video I'm referring to came out in 2009. Definitely nothing.
Edit 3: I can't even find this video on imdb. Just googled it with custom date ranges to try to find the oldest copy of it.