When a woman dreams that she has changed her sex, it symbolizes conception of a male child who will do honor to his family. When the dreamer is a man, it indicates dishonor and infamy.
Dream dictionary: to sex with a sexy aunt in the cauche dream meanings
The rooster or the cock is the animal of arrogance and silliness. Many men have this kind of the dream, especially if they are feeling the lack of sex. Sometimes the rooster can stand for particular person who you see as being someone very cocky, therefore he or she reflects in your dreams.