No. Many guys do or go without anything.
No
Depends on your morality and religion. If you love him/her, then sure and it is love, but if you are doing it for fun then maybe that is morally wrong. However, It is perfectly okay for friends to be naked together sleeping or awake.
100%
No, but it could lead to it.
It's probably "sleep in the nude". And it means sleeping naked, not using a pyjamas, a nightgown, panties, briefs or any other kind of clothing.
No this will not make him sterile.
Sleeping in the nude is more comfortable for guys, especially as they grow and discover themselves. This is perfectly normal and part of growing up. The key is not to make a big deal about it.
Being from Israel is not a bar to sleeping nude nor is it from any other geographic location
yes she is, most of the times
The main disadvantage of sleeping in the nude is if there is an emergency such as a fire, or someone knocks at the door in the night you will need to rush to get clothes on. However, if you keep a robe or dressing gown nearby you should be fine.
Approximately 31% of men report sleeping nude according to a survey conducted by Mattress Advisor in 2020.