Firstly let me fix that headline for you. The term you’re looking for is “raped,” not “had sex with.” Some of those students were as young as 13 & 14 years old for fuck sake! A middle schooler, boy or girl, is NOT mentally mature enough to consent to sex. They can’t even take care of themselves properly yet. So how would they handle something as emotional as having sex? Especially with adults manipulating them.
You also have to take into account the position of authority teachers have over kids. Now you add in the dynamics of sex and sexuality into the mix of what people in authority and power are allowed to do which creates an extremely dangerous mix. The double standards that society and the media hold is pretty obvious. If the teacher was male and the student female they would be calling it rape.