Thomas Nagel takes an attempt at a psychological account of sexual perversion which is supported by specific theories on sexual desire and sexual interactions. In terms of sexual desire, it can be seen as fulfilling an appetite as hunger and sex are biological functions. However, it is not applicable to consider one’s appetite as perverted just because they like to eat inedible objects. Through looking at sex as an appetite, it makes anything sexual to be viewed as normal. However, some appetites are not normal therefore some sexual actions are perverse. Sexual attraction is when an individual carries the traits to make them attractive such as their eyes, hair, personality etc. Thus, it is a buildup of properties within an individual which builds the sexual desire and attitude between the two people. He uses the example of Romeo and Juliet sitting in a cocktail lounge surrounded by mirrors in which they are observing other people. When Romeo notices Juliet and is attracted to her, it arouses him. When Juliet begins to be aroused by Romeo, they both sense each other. Romeo can be aroused at the fact that Juliet is now sensing him as well. It also makes him aware of his own sexuality and its effect on her. This goes to prove that for sexual desire to progress, there must be a mutual perception of the object and of oneself. Once two people are “saturated” with sexual desire, the proceeding step is sexual intercourse. This idea results in the conclusions that sex is reciprocal, some sexual practices are not normal sex and some sexual practises are perverse.