My dad left when I was in elementary school, but before that it was no big deal to see my parents naked. I've always seem my mom naked. LIke so many other people have said, growing up with only one bathroom makes it pretty common. I've seen my step dad a few times but it's more of the "poke head out of the bedroom, see if anyone is still awake, cover with hands, scurry to bathroom"... good thing he only comes on weekends
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My boyfriend and I actually just caught my mom and step dad having sex on the couch. I walked in the house thinking they wern't there because all the lights were off. I was wrong. My b/f and I greeted her on her way to her room wraped in a blanket! Next time I'm gonna make sure I talk to her specifically before coming down to visit!