This article described an increase in the "mama's boy" phenomenon in Turkey, although it didn't go so far as to cite any real data to back up the claim.
What I did like about the article was that it examined what I'll loosely call the Oedipus complex from a cultural perspective. In Turkey, women are substantially less empowered than men and have far less social mobility. As a result, male children tend to be coddled by their mothers, who effectively exercise social power vicariously through their sons upon their reaching adulthood.
What entails coddling, exactly? In Turkish culture it is acceptable for sons to be granted virtually anything they want (read as: spoiled rotten); it is also common for Turkish mothers to grant their male children little in the way of privacy, and for sons to sleep with their mothers until they reach adolescence.
The article does a pretty decent job of analyzing what leads to the “mama’s boy” phenomenon: first, in childhood, sons gain the understanding that they have greater potential for social mobility than do women, and recognize that their mothers are among these less powerful numbers. Then, as the sons grow older, they form ambivalent relationships with their mothers, who via coddling effectively deny the sons the ability to individualize, or to form an identity separate from their mothers. The ambivalence is derived from:
~the guilt of having more social mobility than their mothers and feeling as though they are needed to act in social situations on their mothers’ behalf;
~and the resentment directed at their mothers for denying them the opportunity to individuate.
Needless to say, the article explains, this leads to catastrophic intimacy problems when the sons enter adulthood. The sons are ingrained with the idea of an emotionally intimate relationship and a sexually intimate one as inhabiting completely separate spheres, since their relationships with their mothers have largely dominated their perspectives on interpersonal relationships as a whole.