Oedipus Complex

The Oedipus complex originates in Sigmund Freud's interpretation of dreams. It is a stage of life all children go through from three to five years old, and any trauma or stress during this stage can affect the person through their adult life.
This complex is defined by the child wishing for a relationship with their parent of the opposite sex (sometimes sexual, other times not) and viewing the parent of the same sex as competition.
It is named after the Greek tragic hero Oedipus, who murdered his father and married is mother (albeit unknowingly), and then had four children to whom he 'was both sibling and parent'. The complex's female version is called the Elektra complex, after a woman who helped kill her own mother.
I think that the Oedipus complex isn't that far fetched of an idea - it is real, but the British Encyclopedia Britanica clasifies it as a solely sexual desire with the parent of the opposite sex, while, at the same times, it states that it ends when the child and parent of the same sex can identify with each other.
I think that the complex is not solely sexual, and can occur out of desire to have a closer relationship with ether parent, and being jealous of the other parent because of divided attention or simply how the parent treats the child. I also think that when children are classified as wanting to have a 'sexual relationship' with the parent of the opposite gender, it is a misunderstood term used by adults. It should be physiclly impossible for a child of three years old to want a sexual relationship with a parent, much less generally understand what a sexual relationship would imply. Also, a sexual relationship was originally (and primaly) for reproduction, and I think it's impossible for a child to want this considering their bodies aren't ready for the reproduction stage of life and therefore not understand such a primal desire. I think that a child (say, a daughter) wants a 'relationship' with her father: this could simply be because she wants a closer relationship with her father and is generally jealous of how her mother is treated by her father, and vice versa for a son.