Thread:Merkarion/@comment-5384276-20190224003202/@comment-37165251-20190303141310

Youjutsu is Youkai exclusive. Senjutsu can be learned by Human and, as seen with Sairaorg, Devils also (Touki is a Senjutsu technique). But it is also true that Youkai have it more easy to learn Senjutsu.

In the End Senjutsu is controlling and manipulating of his own lifeforce and, in advanced stages, manipulating the Lifeforce of others (which is a speciality of Nekoushu like Kuroka).

Like seen here it is also what is used as energy attacks in Dragonball^^ (if you take it in DxD ways than the Sayajins are only Ape Youkai^^ :P  )