I Never Understood ?

I always asked myself why when women are in a terrible situation that involve rape, molestation, or being battered they find it hard to inform someone? I always asked myself of course I never been in the situation but I witnessed the situation before with someone I knew & they never find the need to tell anyone. She was a very close friend of mine, I feel like it affected her within her future she's might be a victim but they way she portray herself you would never guess. I ask myself why are certain victims like that, I understand people grow from certain situation's but I never knew why some ( NOT SAYING ALL ) , seem to be more sexual active than usual.