Maendeleo ya Wanaume Organisation (MAWE) Chairman Nderitu Njoka has said 200 boys are sexually harassed daily but only 10 cases are reported.
Speaking in Nyeri when he released findings of research conducted between April last year and January this year, Njoka said seven out of 10 men experience physical and emotional violence.
He said it was unfortunate that despite the alarming numbers, the government had not addressed the challenge.
Among the counties mapped in the research where 2,000 respondents were interviewed include Nairobi, Kiambu, Meru, Homabay, Nakuru and Nyeri.
Njoka wants the government to declare boy-child neglect a disaster and affirmative action introduced to motivate high school boys and protect them against the wide forms of harassment.
He also wants sexual harassment of boys and men addressed socially and legally.