I think Koda Kumi wins in this category. 'Heat ft MEGARYU' , 'Shake It' , 'Candy ft. mr. Blistah' ....
I think the girls from MAX are hot , but Love Screw just doesn't strike me as that 'sexy' . The PV's pretty hot tho
I think hitomi sounds sexy too and Hyori too (she's kpop tho but whatever) , but I just don't find a lot of jpop to be 'sexy' at all.