Sometimes a genuine lack of interest in sex may be brought on by fluctuating hormones, illness, medication or injury. If you are in therapy to recover from sexual abuse or sexual assault, you also may need to go through a period of abstinence from sex while you deal with these issues. When these situations have been ruled out you need to look at your emotional relationship with your partner. For women, emotional intimacy is an essential part of sexual desire and sexual arousal. The usual suspect when sexual interest has disappeared is unresolved anger.
Unresolved issues chew away at the foundation of the relationship.
If you have ruled out a physical cause, look outside the bedroom for the problem. If you feel you partner is not meeting your sexual needs, ask yourself if your emotional needs are being met. Back track with your partner to where the sexual problems started in your relationship and see if there was an incident or situation that triggered you to withdraw sexually. Chances are it is something that gets in the way of you feeling emotionally close to your partner. When you are growing, you are constantly new to yourself and to your partner.