Why so many female teachers tend to seduce and have sex with their students?

I read a article about the involvement of female teachers in seducing and having sex with their students.The students are immature so they are not to blame but the teachers are responcible and have a responsibility for making the students a good citizen.How can it be possible if they are involved in such shameful things.What is your opinion?
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As males of old age tend to attract towards young female .so I don't want answers why male teachers do it.i want why females do it as they have the rationality.
Why so many female teachers tend to seduce and have sex with their students?
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