The original poster forgot to leave the implication of Freud's Oedipus Complex (the female version being called Elektra Complex (a similar story from way back like Oedipus)) theory. Where a son is sexually interested in gaining his mother's love, and competitive with his father.
Uuh No, bluntly put, I think he just thought his mom was a MILF and couldn't see how anybody else could see otherwise, so he wrote up a paper to tell the world of his beliefs.
He has some interesting theories, which I can correlate with, such as what is known as the Freudian Slip, or his dream theories.
Penis Envy and Oedipus, no.