It is recommended that men who ride bicycles should us prostate friendly seats(saddles), as normal saddles put pressure on the prostate. should preteen boys also use prostate friendly saddles?

It should not be a problem with preteen boys, especially just cycling for fun.

It's not the prostate that too much bike riding can injure, but the pudendal nerve that can be compressed with too many hours on a bike. Damage to this nerve can lead to numbness and erectile dysfunction.

Saddles should be comfortable to sit on and not rub against the are of the prostate in all males.