Well, my experience was actually rather fun... but then again, both ex's knew the deal. There was even a hilarious story attached:
One time I run into my ex at the store. I was dating another girl at the time, but our relationship was kinda PG-13 and I had massive blueballs being at the height of my raging boner phase. So, one thing leads to another - she goes back with me to my parents' apartment, since they were out of town. Place as all mine.
Her and I are at my place, Enigma is playing in the background, the girl is working and twerking (had an amazing body, btw).... Anyway, long story short - we're fucking like crazy. Thank heavens Enigma was singing pretty loudly, because it covered up my ex's moans, as my mom entered our apartment. Yup. that was my "OH SHIT OH SHIT OH SHIT!!!" moment. My parents really like my girlfriend. There's only one exit out of my place and it's right past the living room and kitchen. We're on the 2nd floor and facing the walkway lined with benches. Benches are full of old gossiping ladies. FUUUUUU. How do I get my currently naked girlfriend (with her clothes still on the living room floor) out of my place????
Ok, ninja move: I go to the bathroom, intentionally throw toilet paper to flood the toilet. Then I call mom for help with unclogging, while I sneak my ex's clothes back into my room. She's geting dressed, while I'm distracting my mom. Dad should be home any time now. How the fuck will she sneak out unnoticed? Crap. I look red. My mom knows something is wrong. She's probably thinking I was jerking off. Which would be good, given the situation. Rather be caught as mastrubator than outed as a true scumbag that I am. I had a good thing going, why did I need to fuck my ex? Fuuuuck.... Ok, think, think, think. What am I gonna do????
Ok, here are my karate belts. Several. Progression from white, to yellow, to blue, to red... Fuck, all the colors of Benneton! Tie them up, got a rope. Allright, girl!!!!
Me: You know how to rappel, right?
Her: O.o errr????
Me: R-A-P-E-L-L?
Her: How?
Me: I hold the rope, you hold on and tip toe your way down the wall to the ground and then RUUUUUUN!!!
Her: You mean, out your window and holding on to those belts?
Me: If you have any brighter ideas, let's hear them!
Her: How about I just walk out and pretend like nothing was going on. I was just stopping by. You know? Plausible deniability?
Me: Yup. sure. that will fly.
My dad enters. Fuck. No way out the front door now. Well, desperate times call for desperate measures. I pop the screen out of my window and she jumps up on the table, holding on to the rope. Next thing I see is her shoes flying down to the ground. She rapells few steps down, slips her leg, bangs her knee (ouch!!!) and next jump takes her all the way down. She grabs her shoes and facing astonished old ladies shouts out: "No need to worry, just practicing for Marine Corps entrance exam. Huahhh!!!" and runs away. Old ladies with opened jaws just follow her with their eyes, as she limps away.
Met up with her later that day. Awkward feelings, I think it was embarrassing and anticlimactic. Nah. She was so aroused by all this adrenaline, she fucked me in the back of her car, banged up knee and all. I did feel guilty and like shit... yet, as luck would have it - I found out why my girlfriend was all PG-13 on me. She was banging someone from her class (few years my junior) and didn't have the guts to break up with me. Her friend supposedly "confided in me", but I suspect that she simply didn't have the guts and had her friend out her. Either way, I didn't feel as bad about cheating and continued my FWB relationship with my ex for few more months. Fun while it lasted. Made the break up that much more bearable.