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Secondarily, sex is a complicated subject. It brings on a lot of emotions that may or may not be real. Some people love because of emotions and others love because of good sexual chemistry. Not all people can detach their emotions while having sex. After an intimate moment with a partner, one may become attached to the other in some way. This causes a change in emotions. Jealousy and possessiveness can occur. One may find themselves envy of the other males or females that are getting the attention of their partner. This causes one to start controlling who the other hangs around. Eileen Smith gave a real-life example of a situation that occurred with one of her friends. Smith stated, "That's exactly what my friend Lori expected when she slept with her friend/roommate Marty one night. Marty was about to move abroad, so a full-fledged relationship just seemed too complicated, and the two never actually had a conversation defining the relationship. Yet when Lori started seeing other people Marty went ballistic. Living together for a few months after he moved back did not help." (Smith).
The biggest mistake of this situation was that they did not even discuss what they were doing. They just acted off of bodily emotions. They did not set any limits or expectations. Apparently Smith's friend thought that it would be a one night stand or just some fun for a little while, but Marty felt a bit different about the situation. He became controlling as if she was his girlfriend instead of a sex partner. He did not want her having sex with other partners besides him. .
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Another example of a failed sex friendship would be from Nolan's advice column. In Coleen Nolan's column, a woman stated, "I found myself becoming jealous of every girl he brought back to our shared apartment and I suppose he was jealous of the men I dated" (Nolan). When feelings start to get involved in the decisions one makes, it turns the game into a dangerous one.