IT sounds plausible to me.
On the logistics bit, I once fingered a girl under the kitchen table at a party, as we were all sat round it having a drink. We were sat very close, but it can be done.

On the it being obvious part, I once had a wank on a plane. I was sat in my seat, doing it under the blanket. Now, I knew that everyone around me knew I was having a wank. They were also too embarrassed to say anything. My point being that if you're doing something along those lines in public and don't give a fuck, you'll usually get away with it.
( The Awful Puppy Bakery is still bored, Thu 17 Jan 2013, 17:34, 2 replies)

She was game for most things, and a bit of an exhibitionist.
I shagged her in a horsebox that was parked in a busy paddock at a horseshow once.
(username failed moderation, Thu 17 Jan 2013, 17:37, closed)

whore's box
lol
( 4Q just lurking, Thu 17 Jan 2013, 19:08, closed)

Something something TESCO BURGERS.
.
( rjmrjm, Thu 17 Jan 2013, 19:10, closed)

something something UNNECESSARY FULL STOP

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( Dr. Shambolic je suis charlie, Fri 18 Jan 2013, 8:13, closed)

You really are a charmer,
aren't you?
( monster munch person, man, woman... camera... TV?, Thu 17 Jan 2013, 19:40, closed)