I don't think that happens to only guys with fat dicks. It all depends on the person doing the sucking, IMO. I wish every person I ever encountered that wanted to blow me would have some reasonable talent in that area. I've had my share of "bad blow job" experiences. Those that just slob and never actually suck. Others that think giving it quick kisses like it's a cheek is also a downer. Which is not to say I'm the beneficiary of a lot of head, but I'm willing to personally try out any applicants. And I'm willing to reciprocate.
