I am a fit, healthy, 21 year old female, but I have no sex drive. I find I crave sex occasionally when single and in the beginning of a relationship, however after about 3 or 4 months have no desire to have sex ever. I don't even want my boyfriend to go down on me even though it is the only way I orgasm. I dread my boyfriend making moves on me and he complains I never initiate sex even though I find me initiating much hotter than him initiating sex. I want to want to have sex! Even if I was in the mood once a week or once a month I would be happy. I don't even think about sex and am not easily turned on. Once I start having sex though I can enjoy it.
What can I do to increase my libido? Are there possible reasons why I feel this way?