Attraction is incredibly complex and multifaceted. When you ask people what they find attractive, they say one thing, but in real world situations they rate attractiveness differently. Beyond certain physical traits, I think most people have no idea what causes them to be attracted to others. An often overlooked part of attraction has nothing to do with physical traits--people with high levels of self-confidence and self-awareness are found to be more attractive. There are many reasons for this, but I think the main one is that people love it when others are genuinely interested in them, which they show by asking really good questions, demonstrate real interest in their answers, which, in turn, generates more interesting questions. People who have traits that they believe are highly undesirable (e.g., stuttering) are often extremely internally focused and consumed with mitigating their perceived deficits. One of the main problems with this is that it leaves them less able to focus on the prospective romantic partner. They don't listen as carefully to what they're saying, they ask fewer and less salient questions, which inadvertently sends the signal that the other person doesn't really like them. Yes, of course if they're looking for a muscled jock and you're skinny it's probably a non-starter, but I think a lot of people who are looking for a romantic relationship are somewhat flexible regarding physical traits. I strongly believe that stutterers who think of their stuttering as a highly unattractive trait and who actively try to suppress their stutter (avoiding certain words, using "strategies", etc.) results in an internal focus and has the overall effect of making them seem less attractive and even self-centered in dating situations. This is one of many reasons I think avoidance reduction therapy is the best therapeutic approach for stutterers.