I have had this dream around 3 times in my life, all within 18 months.

I start by doing something sexually arousing with someone, not sure what or who, not my girlfriend, and I feel like its wrong but I do it anyway. Suddenly i hear a cough or small noise like clearing your throat. I turn and I'm in a van or truck and and my dad is driving down the highway in the middle of the night with the radio on. My dad doesn't notice me or say anything and then my dream fades.

I think this actually means something, but what?