I was reading The Wisdom of Enneagram Riso and Hudson and found the following:
Sexual types tend to have difficulty pursuing their own projects or taking adequate care of themselves, because on a subconscious level, they are always looking outside themselves for the person or situation that will complete them. They are like a plug looking for a socket and can become obsessed with another if they feel they have found the right person for them. They may neglect important obligations, or even their own basic necessities, if they are swept up in someone or something that has captivated them.
The above is not Four specific and yet I can relate a great deal to it. These habits have got deeply ingrained in me.