I don't know if i believe that. Most guys i know are willing to go down, but it's because they want to score. For me, it's like ... if i've got 10 mins with my girl before we absolutely have to leave and go somewhere, i want to go down on her for 10 mins., then bounce.
If this still doesn't count as too much info, then ...
i really don't have many birthmarks/freckles/etc... however i do have one freckle from birth on the bottom of my sack.