Thought I should try and keep this up. I saw a few new family guy ones. In Family Guy - Quagmire Wants Lois Bad 3:22 Lois mentions that after the steak she had, she's gonna lay down on the toilet, its only implied but you get her holding her stomach a little.

And in this Family Guy - Peter uses Women's Restrooms (Season 16) 2:50 Peter's in the womens bathroom at a tennis match, where you can see two pairs of feet moving while grunting, kinda like a tennis match too.
Tried to put the link there, but it counted as spam for some reason so just copy and paster the names i put here on youtube,