Why do us women have to do all the cooking?

If you read my question as should most people here i didnt say it was my personal experience. im not even married yet for gods sake. i was making a general question, as most men, believe it or not, are this way. This has nothing to do with me on the most personal level, but i know my hbby to be expects me to wash and clean etc more than he will. and i was merely asking as to why men expect.