NO where in Scripture do we find ANY angels; fallen or not; having SEX!
Matthew 22:30
At the resurrection people will neither marry nor be given in marriage; they will be like the angels in heaven.
Since SEX!! is shown; throughout nthe Bible as being permitted ONLY a marriage context; I can only ASSUME (I know...) there will be no SEX! in Heaven.
(NO wonder so many people seem like they want to go to Hell!)
Angels are not humans, dead people do not become angels