Despite this bit of physical comedy, potty humor doesn't play a large role in "Step Brothers," which, like all of Mr. Apatow's films, is firmly, perhaps self-consciously, rooted in what Freudians term the phallic stage of human development, not the anal.
Obstetric trauma has been regarded as the major aetiological factor in the development of anal incontinence in women [ 12].
The MAHS is a longitudinal cohort designed to examine the role of HIV-1 in the development of anal dysplasia [30], composed of 337 men, recruited in Seattle, Washington between 1996 2000.
Sexually transmitted human papillomavirus (HPV) is the primary cause of cervical carcinomas, and HPV is also thought to be the most important aetiological factor for the development of anal cancer (Frisch et al, 1999; Daling et al, 2004).
Therefore, the possible role of multiple infections in the development of anal dysplasia remains unclear.
One potential explanation for this is that whilst antiviral therapy may reduce competing mortality risks, it has no impact on the impact on the natural history of HPV nor the likelihood or HPV co-infection and, moreover, increasing life expectancy allows sufficient time for the accumulation of genetic mutations implicated in the development of anal cancer.
Since the risk of developing SCAC increases with the total time elapsed with CD4+ count below 200 cells/μl, it has been hypothesised that HIV-related immune suppression acts as a cofactor to HPV in the development of anal dysplasia and progression to overt carcinoma [1, 3, 4].
High-risk HPV is also suggested to play a key role for the development of anal cancer and precancerous lesions [4], [5].
Anal HPV infection, which contributes to the development of anal warts and anal cancer, is well known to be common among men who have sex with men (MSM), especially among those HIV positives.
There is little doubt that vaginal delivery in general, and obstetric anal sphincter injury (OASI) in particular, are significant contributory factors in the development of anal incontinence [ 4].
