RPW, I just realized something over the weekend. Perhaps it's me being slow, but this concept really hit me right on the head lately.
The reason why hobbies are so important is not only does it make you interesting long-term, but it means that you are able to put your energy into developing a skill/passion instead of constantly seeking male attention.
Too many women essentially use male validation as a hobby - the consequence is that even if she does secure marriage, she still is a risk at infidelity because she seeks her fun and interests in men instead of herself and her own life.
Even if you are technically loyal to him, he wants to see that you are able to be happy regardless of any male attention/validation. THIS is true security in oneself.
This is why it's so important to have your own girlfriends, to have your own hobbies, to have good relationships with your family/siblings.