My Mom Won't Stop Talking About Sex & People's Asses!!

Help! Can someone please explain what the issue may be.

My mom seems to always think, talk or focus on sex and/or people's asses. For example, when we're watching tv, she doesn't seem to notice anything about the commercial, show or movie except how the actors' asses look. She'll comment on how big their asses are or how small they are or how it's shaped. It's SO annoying!! Ass or sex seems to be the only things she focuses on.

Example #2: Whenever I walk past her in the living room, if I quickly turn around, I can catch her looking at my ass when I walk by. It infuriates me! Or, when we're out shopping, she'll always try to walk behind me as if she's trying to see my ass.

Example #3: If we're watching a movie & a girl or guy gets raped, she immediaty says things like, "Oh two or three guys must have gotten him/her at the same time!" or "Ew, they all got her at the same time & used her up." I mean, WTF does that have to do with anything & who says things like that!? When someone is raped, I immediately feel bad for them & what they've gone through.

Example #4: When there's a sex scene on TV, she is glued to the TV but constantly says things like "Eww, I knew this was coming." or "Eww, just look at them."

I just don't get it. If it has something to do with ass, sex, bodily functions like pooping, periods or bodily smells (particularly butts) she is interested! Seriously. She was even commenting on how my dog's butt hole looked the other day. Can someone please explain or elaborate on what may be going on! Mental condition? Underlying abuse issues? Or just plain ol' weird? By the way, she's 66 years old.