Your lack of sexual urges indicates a failure in genetics, low intelligence and poor emotional development. Sex is amazing and horrible. Like all things involved in the human condition, it can be part of the best and the worst of us. Sex is part of an amazing connection with the person you choose to be your partner, or it can be meaningless gratification, and is tied into us not on just a primal level, such as reproduction, but on an emotional and intellectual level as well.
Alberta Einstein was a lusty individual, as was Carl Sagan. Stephen Hawkins is quite the kinky individual, and it would be a hard argument to say he is not an intelligent man.
Asexuals, when exposed to analytical psychology, are often revealed to be repressed homosexuals, or suffering from sexual trauma. Mental retardation is not often a barrier to sexual desire, as those with down's syndrome can attest, but an aversion to sex is often present in malignant and maladjusted personalities, unsavory characters of poor demeanor and an inability to fit in with society in general, often holding a deeply seeded repulsion towards memebers of the opposite sex. They see in the opposing gender something they, for a variety of reasons, cannot possess, and so develop a loathing orientated towards both themselves and the unobtainable. Physical interactions with a willing sexual partner is healthy human interaction, and the inability to understand or unwillingness to engage in this behavior is an indication of mental unwellness.