I need information about shallow relationships, why people get in them etc...?

One of my best friends is always subjecting herself to shallow relationships. I feel like she never dates anyone for their mind, but just for sex and because she doesn't want to be lonely. These relationships are always doomed to fail. She puts herself in positions where she must subconsciously know that the relationship wont work out. I want VALID information backed up by studies to explain why people do this and how to have them realize and help themselves out of this habit. Any medical sources and journals are prefered.I need information about shallow relationships, why people get in them etc...?
Hmm don't limit yourself to just psychiatry and journals. Experience is just as valid as evidence, because most research found in journals comes from gathering ppl's experiences in one way or another. Then it becomes evidence. I know, because I did research in this way and it is about to be published, lol. Not on this subject tho.





So....





Being deprived emotionally as children, therefore trying to fill a void. In contrast, someone who is secure as a child will be sure of the quality of person they want, and secure enough in themselves to wait until the right person comes along.





Parents setting an example of shallow relationships or multiple relationships so they think this is the norm, or they think this is love. Someone from a secure home has role-models of parents who seek one partner for life and stick together and communicate to work through difficulties. The contrast to shallow thinking.





Parents don't communicate with them, so they never get told anything, they just have to find it out from their friends or the big wide world. So school relationships are all shallow and they copy.





If you have been sexually abused you think this is how to please people and be loved.





If you ask your friend about her childhood I bet one or more of these things are the case.I need information about shallow relationships, why people get in them etc...?
Sexual attraction doesn't make the relationship 'shallow'...promoting the species is the basic reason for animals mating in the first place! The truth is, the unrealistic, modern 'civilized' reasons for dating are the shallow ones...they don't allow for the natural call and response to interpret sexual and physical indications of health and compatibility.