Roughly :
Hinamizawa 5 Best pervert !
Number 5 is Maebara ichiro (Keiichi's father) who is a lolicon (mention of Rika, Satoko and hanyuu).
Number 4 is Irie Kyousuke, with his maid fetish.
Number 3 is Ryuuguu Rena (speaking of old men, etc).
Number 2 is Sonozaki Oryou, who is a SM lover
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Number 1 is Furude Rika (didn't get at all why she is at this rank.. something she REALLY loves... hum)