Mine is that she and I are discovered, (but not stopped or interrupted) by a passerby as we are in the midst of our sexual exploits... and of course, it involves being outdoors in a relatively private place... what an immense turn-on it would be after-the-fact to find out we had just "performed" for an audience! But that's just me...

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"I believe in nothing that I cannot touch, kiss, embrace.... The rest is only hearsay." ~E. Abbey