When I was growning up in India I lived opposite a military training camp where young recruits went through basic training (what Americans would call bootcamp). I was able to see what went on during basic training.

Each squad of soldiers was entrusted to two instructors. While one instructor yelled out orders, the other instructor strolled up and down the ranks, swinging a thick wooden swagger stick. If a soldier made a mistake, he would yell abuse in his ear (sometimes twist his ear, or slap his face, or twist his nose), swing the swagger stick back and smack him smartly either on his ass (the recruits wore short khaki shorts) or on his thighs (which was even more of a turn on for me because I could see the welts). The sound of their fellow soldier's chastisement would only make the other soldiers more nervous and cause them to earn more punishment (and cause me to leak more precum).

Sometimes the whole squad would screw up. They would then receive a collective beating. The instructors would methodically go down the ranks hitting everyone4. The ones in the back row would have the added torture of anticipation. If a soldier involuntarily threw up his hand to cover his ass, he would get double or triple the punishment.

I must stop now to go and jerk off; I have managed to excite myself too much.