Avoidance of sex is called as Sexual Anorexia. People who suffer from this disorder usually have a feel of self-hatred after getting involved in sex. These people might have fears of getting the sexually transmitted diseases and usually avoid or dread sexual intimacy. Sometimes this is also due to the encounters they had in the past like sexual trauma etc. The patients might feel angry when the topic of sex comes up. The common causes of sexual anorexia include rape, sexual abuse, recent childbirth, hormonal imbalance, and strict religious upbringing about sex, power struggle with the loved ones, exhaustion, and breastfeeding and so on. Though there are no individual tests done to identify the condition but in case you feel you are suffering from it, you need to get in touch with your doctors at the earliest and get a medical treatment done.