Female 

• Failure of vaginal lubrication
• Failure of vasocongestion
• Failure of uterine elevation and vaginal ballooning during arousal
• Oestrogen deficiency leading to atrophic vaginitis
• Radiotherapy for malignancy
• Vaginal infection e.g. Trichomonas or herpes
• Vaginal irritation e.g. sensitivity to creams or deodorants
• Abnormal tone of pelvic floor muscles
• Scarring after episiotomy or surgery
• Bartholin's gland cysts/abscess
• Rigid hymen, small introitus

Males

• Painful retraction of the foreskin
• Herpetic and other infections
• Asymmetrical erection due to fibrosis or Peyronie's disease
• Hypersensitivity of the glans penis

How common are sexual disorders?

The majority of adults can recall times in their lives when they were troubled with low desire or problems with orgasms. Arousal difficulties increase with age. Sexual dysfunction may arise in the most well-adjusted and satisfied of couples. In 100 educated young couples Frank et al (1978) found that 50% of men had difficulties with erection, ejaculation or orgasm sometimes and 75% of women had problems with arousal or orgasm sometimes.

Table Three: Estimated lifetime prevalence of sexual problems in young adults (at some time).

• Women

• Reduced libido 40%
   
• Arousal difficulties 60%
   
• Reach orgasm too soon 10%
   
• Unable to have orgasm 35%
   
• Dyspareunia 15%
   

  Men

• Reduced libido 30%
   
• Arousal difficulties 50%
   
• Reach orgasm too soon 15%
   
• Unable to have orgasm 2%
   
• Dyspareunia 5%
  

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