Swimming Sim Will...Moan?

Hey. So, I started a new game yesterday, and moved my characters into a mansion using the freerealestate cheat. It has a pool, and whenever my Sim gets into the water, she starts thrashing around and moaning. At first I thought she was freaking out, because she was skinny dipping with her husband. Now she's alone, and still doing it. She is not a hydrophobe.

I'm just wondering if this can be explained. :D