Parker, who's only 21 years old, is doing something he shouldn't be doing: He's watching 40-year-old wife and mom Sierra as she's getting dressed. She catches him, and he thinks he's in trouble. But he's not in trouble. However, he is about to be in her mouth and pussy.

Sierra, who's from California and lives in Houston, Texas, told us she once had sex with a 20-year-old.

"Let's just say it was a very pleasurable six minutes," she said.

Here, Parker lasts a whole lot longer.

Kinkiest sexual encounter: "On top of an office desk while everyone else was in a meeting."

They missed out.

Sierra on being watched while she's fucking: "It depends on my mood, but usually yes. Nothing really beats a packed room in a swinger club."

She's had sex with eight of her girlfriends. Beats lunch and shopping if you ask us.

She calls herself "a normal girl next door." Yeah, we wish every girl were like her.