In the context of Sigmund Freud's theory of psychosexual development, if an individual, during the resolution of the 'Electra Complex' or 'Oedipus Complex' at the subconscious level, fails to establish identification with the same-sex parent and instead remains mentally stuck at that stage, according to Freud, what will be the most prominent psychological impact of this developmental fixation on the person's adult behavior?

According to Sigmund Freud's Psychosexual Development Theory, around the 'Phallic Stage' (ages 3 to 6), a boy experiences the 'Oedipus Complex' and a girl experiences the 'Electra Complex'. In this stage, they feel special attraction toward the opposite-sex parent and rivalry toward the same-sex parent. Under normal development, they resolve this conflict by establishing identification with the same-sex parent. If fixation occurs at this stage, the individual exhibits possessiveness, extreme competitiveness, feelings of insecurity, and complex psychological problems in adult life regarding relationships.