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Normal
The simplest and most fundamental answer to your question is that hearing people use prolonged eye contact to indicate sexual attraction. Hearing people have a very complicated set of well understood but unwritten rules concerning how eye contact is made and how long it is maintained. Even a slight deviation from these rules can lead to a socially uncomfortable situation. For this reason, hearing people must break eye contact regularly throughout a conversation in order to adhere to these rules. Among hearing people, prolonged eye contact is either interpreted as sexual attraction, or it is considered weird.