«Over a third of cases go unreported because they don't think it will be taken seriously. (politics.co.uk)
And, according to a 2013 New York Times report, these assaults often go unreported for fear of being punished, ignored, ridiculed, or even discharged for sexual contact with another man (prior to 2011). (businessinsider.com)
Official numbers are believed to be lower than the reality since many go unreported. (caughtoffside.com)