My subconcious is fucking with me. I consider myself a happily married man with 1 young son. Yet last night, marks the 2nd dream in a month about another woman. The first one involved a girl I knew after high school. This one involved a girl that was 20 yrs old or so. No one that I can link to reality. Now that I am in my 30's, does that make me a dirty old man. Anyway the weirdest thing is I rarely remember dreams but these are so vivid..... 
Don't worry about the dreams, man. It's normal. Have you ever dreamed about midgets running around in speedos throwing mini doughnuts at you? That would be sweeeet.