Cute but come on. I'd imagine like half of the wishes to have a sexual nature, which would make turning an extremely frequent occurrence.
The death god population should be getting out of control.
She specifically wished for Sou, though. I'd imagine most sexytime wishes end up being either generic(ie, "I don't wanna die a virgin!") or involve predetermined people(eg, "I wanna f*ck Stacy's mom!"). Also, condoms.