A big dick means your wife is more likely to cheat on you. At least if you are a Kenyan fisherman. User Chicup, in the Particularly Prominent Peni subreddit, 03 Feb 2016
"every one inch longer penis [was above the median] increased the likelihood of women being involved in extra-marital partnership by almost one-and-half times" -- Predictors of Extra-Marital Partnerships among Women Married to Fishermen along Lake Victoria in Kisumu County, Kenya User brotherwayne, in the Reddit Science subreddit, 28 Apr 2014
PLOS ONE: Predictors of Extra-Marital Partnerships among Women Married to Fishermen along Lake Victoria in Kisumu County, Kenya User burtzev, in the Psychology of Sex subreddit, 21 Apr 2014