In the Journal Article - Predictors of Extra-Marital Partnerships among Women Married to Fishermen along Lake Victoria in Kisumu County, Kenya, the following: Domestic violence, denial of a preferred sex positions, longer erect  penis, younger age and increased sexual satisfaction were the main  predictors of women's involvement in extra-marital partnerships.

On Penis Size: 

Results show that in the perspective of women, large-sized penises  are associated with extra-marital partnerships possibly due to pain and  discomfort during sex. This is contrary to men's perspectives that have  caused them to do all sorts of things to augment their penis sizes. Some have even insisted on penile enhancement against medical advisories that their penises are within the normal size. This is probably because of the received and popularized fallacy equating a larger penis size with masculinity. 

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