Most guys don't do anything. Most of those who do anything lightly trim if there is an excessive amount of hair. Relatively few guys shave down there because most women don't want to see a guy shaved clean down there, looking like a pre teen. Also, after shaving, it can itch like there is no tomorrow as the hair grows out, not to mention that it is very easy to get nicks and cuts in the scrotal area.
Male Body Hair Grooming Guide
1)Legs/Arms: Most guys who want the look of a more moderate amount of hair on the legs or arms, trim it with a clipper fitted with a #2 clipper guard every three weeks or as often as desired. The guard should not be pressed to the skin. A free hand technique is used where the guard is barely above the skin. The object is not to cut every hair to guard length but to leave some hair long, some medium and some guard length for the look of a guy with a more moderate amount of hair. After the free hand technique is learned, a #1.5 or #1 guard may give a better result on the legs from the knee up.
2)Down there: Hair down there in the groin region can be trimmed using a similar free hand technique keeping the guard higher above the skin so the hair is left longer.
3)Chest and Stomach hair: Can be clipped, shaved or waxed. For shaving most body hair, a flexball power fusion works well; blades that have become too dull to shave facial hair can be used to shave most body hair for at least as long as used on facial hair. Can also be shaved in the shower with a wet/dry electric shaver after creating a rich lather with soap.
4)Outer Glutes: Usually shaved in the shower after creating a rich lather with soap. Can also be clipped or waxed.
5)Inner Glutes: Hair between the glutes can be shaved in the shower with a Mach 3 from the inner part out with very gentle strokes after creating a rich lather with soap. (The opposing trimmer blade on a fusion is why it should not be used in this area.)
6)Shoulder, Upper arm and Back hair: Is usually shaved or waxed. Back hair can be shaved in the shower with devices like razorba and mangroomer.
7)Underarm hair: Can be trimmed with a #1 guard touching the skin every three weeks or as often as desired; if a longer cutting guard is used, the hair can itch for the first week as it grows back.
When shaving body hair that is at or near full length, should first be trimmed as short as possible with clippers, not possible in some locations such as innermost area of the glutes.
Shaving or trimming hair has no effect on future hair growth; future hair growth is determined by inherited DNA.