Complex sentence: Sexual anorexia is a pathological loss of "appetite" for romantic-sexual interaction, often the result of a fear of intimacy to the point that the person has severe anxiety surrounding sex with emotional content i.e. in an intimate relationship.
Split into simpler sentences: Sexual anorexia is a term used to describe a loss of "appetite" for romantic-sexual interaction. The term is used broadly and can be more precisely defined as a fear of intimacy to the point that the person has severe anxiety surrounding sex with emotional content i.e. in an intimate relationship.