Afternoon delight?

From my straddled position, I can feel the firmness beneath me. My legs, knees bent, begin that natural rhythm. Oh, God, What am I doing here?!? This isn't me! I don't do this sort of thing! But, it's too late. There's no turning back now. The heat begins to radiate throughout my body and the aching has begun. My breath increases with each up and down motion, accompanied by an excruciatingly loud heartbeat ringing in my ears. We turn and my mind screams "STOP", but my body just won't listen. And even as I miss my one opportunity to escape, the anticipation is continually mounting. My limbs begin to tingle and the heat is now a flame consuming me. My body glistens as the pace becomes more and more furious. Faster and faster, until I can no longer breathe. At any moment, my heart will burst. One last brutal pump and I finally reach that magnificent summit! Excitement overtakes me and I fall back to coast on the sheer delight of completion. A shiver washes over me and warmth settles over my entire frame. A whisper of shame hovers in the air around me as I dismount as casually as possible; legs trembling, face red, unable even to speak. Man, I can't wait to ride my bike again!