Picking a number for this seems like a really bad idea. For most modern clinical definitions of disorders what matters is whether it interferes with normal daily behavior. Even that is questionable since what constitutes interference is very hard to tell.

Societies have had very different notions of what is acceptable sexuality for both males and females. Until fairly recent homosexuality was considered a mental disorder in the US. And in the Victorian era, women were routinely diagnosed as nymphomaniacs for showing pretty minimal signs of sexuality.