"I am just your average mom having fun," said Petunia, aka Pretty Petunia, a 53-year-old wife who's here to make her 50PlusMILFs.com debut. "I have a lot of vanilla friends." Those vanilla friends will likely be shocked by what she's doing here: checking out her big tits in a mirror (and liking what she sees) then getting totally naked and deep-fingering her experienced pussy. In her spare time, when she's not having wild sex parties with her non-vanilla swinger friends, Petunia plays on a coed kickball team and bowls. She's into the outdoors and boating. When she's out in public, "I dress in your basic mom gear ... jeans and a tee or sexy top." As for swinging ... "My husband and I started about 15 years ago. My first house party was…