OK, I found some that I would agree are true euphemisms, very clear to understand, that I think have a place in our community:
They found him naked in the alley behind the bar, beating the slippery flute.
You should have seen him playing hide the christmas tree.
I couldn't believe my best friend was actually grooming the marbles.
For one of his intelligence, he was remarkably adept at sniffing the canyon.
Needless to say, I promptly began pounding the dermal cave.
This is not an appropriate place for beating the peach.
Then, I had to sit next to some crazy guy on the bus who was apparently nibbling at the pelvic oboe.
Like most guys his age, he wasn't above blowing the flute.
Arriving home early, he was shocked to walk in on his roommates trolling for the bishop.
You can't expect me to believe you were only filing the limp pastry.
Instead, he spent the night alone, wrestling the worm.