Sounds are important in Pāli:
Plural of dēva is dēvā; plural of sankhāra is sankhārā.
Feminine of dēva is dēvi; Manussa is huaman: feminine of purisa (male) is itthi (female).
Yes. Dēva belong to kāma loka, and they engage in sex. However, children are born instantaneously (ōpapātika). It is said that equivalent of of a human 16-year-old appears in the lap of a dēvi/dēva. They don’t show aging like humans, but when it close to the end of the lifetime “aging shows”, and it becomes apparent that they are close to death.
Brahma realms are above the realms of the kāma loka (including human and dēva realms).
Brahmās (actually the plural of brahma is brahmā), are born there because they have seen the adeenava (unfruitfulness) in sense pleasures. So, there are no sense pleasures (smell, taste, and touch including sex) in brahma realms.
Therefore, there are no male/female brahmā. They don’t have sex organs, and are born ōpapātika. Of course, they do not have dense bodies at all. Dēvā have “physical bodies”, even though much finer than ours. But brahmā do not have any type of “physical bodies”, i.e., no karaja kaya.
Those who attain various levels of Ariya/anariya jhāna are born in brahma realms. The following phrase always appears in suttās (actually the plural of sutta is suttā) describing jhāna: “vivicca kāmēhi, vivicca akusala dhammēhi..” or “one gets to a jhāna by “abandoning kāma rāga and akusala kamma“”.
Now this “abandonment” is just “SUPPRESSION” for anariya jhānā; those with anariya jhāna still have “kāma rāga anusaya“. Therefore, they will come back to the human realm, and could be born in the apayās later on. But those who cultivated Ariya jhānā do not come back, since kāma rāga anusaya is removed; in terms of the recent post,”Kanha (Dark) and Sukka (Bright) Kamma and Kammakkhaya“, the “hook for kāma rāga” has been removed.