Yes, it is an interesting “contradiction” to say that angels are sexless and then to say that the “sons of God” were fallen angels who procreated with human females.
Naam, ni jambo la kufurahisha “utatanisho” kusema kwamba malaika hawafanyi nkono na kusema kwamba “wana wa Mungu” walikuwa malaika ambao walizaa na binti za wanadamu.