What if Someone has no Sexual Attraction at all?

  Here's a line of thought perhaps fresh to the same-sex debate.
  We have long accepted that most people are not attracted sexually to those of their own sex. So, if we now add to that that some are not attracted to the opposite sex, does it follow that there might be someone who carries no sexual attraction for neither their own nor the opposite sex? Scientific logic might suggest we explore the question. If there is a gene that determines sexual orientation, what if that gene is missing? Or, why could it not be programmed so there is no sexual orientation at all?
   Does such a person exist. If so, the undiscovered human being, for has such a person ever been found? Perhaps they themselves don't even know they have no sexual orientation. Their feelings are normal enough to them. Never having known a feeling, they might not even know what they are missing. And, they are taught to match off and marry someone, so they do it.
   If there are such people, there is another type of attraction that perhaps would substitute. Every person, it seems to me, has an innate desire to be loved, an attraction to the companionship of others. Maybe the person born with no sexual attraction confuses this attraction to be his (or her) sexual attraction.
   Well, I am just considering all possibilities. I, for my part, rather guess no one is born without sexual attraction.
    It seems to me, though, that we should be considering this, as we attempt to come to the right determination on whether same-sex marriages are normal and should be allowed. I think you explore all you can think of, every avenue, if you truly want to do what is right.