His Erogenous Zones
Bundles of nerve endings are in and around the ears, making them ultra sensitive to your touch. Use the pads of your index finger and thumb to massage the outer ears with slow, firm movements. Gently squeeze the earlobes. Explore the area behind the ear with your lips and tongue, and then blow lightly. Don't be shy about making noise while you're lingering there -- the sound of your breath and moans is a huge turn-on for most men.
It is very unlikely that a man will not enjoy kissing his partner. The more you kiss the better. Lips are sensitive and for men it is easy to get him aroused just from kissing. Kissing lets him know that there is (probably) more "good stuff" ahead and that starts his mind fantasizing.
The neck is always a great place to turn on your partner. There are several things to keep in mind here, most importantly controlling yourself. Hickies may have been the big thing when you were younger, but most men hate them, especially when they have to wear turtlenecks for a week! (If you must suck for blood, keep the hickies to places that are usually covered by clothes). Try to have a moist mouth, but don't slobber! Cover different areas of his neck with tender kisses, using the areas under/behind the ears for extra stimulation. Light nibbling and tugging usually work really well also. Start out soft and gentle; as he gets into it, slowly go harder and wilder to release his beast within.
The scalp can be very sensitive to stimulation, and since he's probably not expecting you to give any attention to it, surprise him. Many men like to have a gentle head massage or scratching, so if you have nails, gently run your hands through his hair in circular motions while lightly scratching his scalp.
To many men, the chest is one of their favorite body parts. To appreciate it is to appreciate the man. Massage it and occasionally whisper how much you love how hard it is (especially if your man works out). Nipples are highly sensitive and should be sucked and nibbled on. Just remember to start out a little slower and work up to harder techniques. Watch for discomfort, some partners have a lower pain threshold then others, so again, communicate.
His Inner Thighs
Inner thighs are always a great place to turn your partner on, as they don’t get touched much during every day life. Whether it is touching, kissing, licking, or nibbling, virtually everything you do around this area will feel good.
His Glans Head
This is the pinnacle of stimulation for a man. The glans head is the purplish, mushroom shaped mass at the top of a man's penis. This is the most sensitive part of his body and concentrating on it is the easiest way to get him off. Men with foreskin have a more sensitive glans head and sometimes need to be handled more gently.
The perineum is the area between the scrotum and the anus. There are a lot of nerve endings there and it is quite responsive to gentle fondling. For a smoother experience, try using a little artificial lubricant or massage oil. You may want to try vigorously massaging the perineum just prior to orgasm; this gives many men a rush of pleasure.
The Anus has a large number of nerve endings surrounding it and it is very sensitive. The proper stimulation of this area can heighten a man's pleasure.
The scrotum is the sack that holds the testicles. This is a very sensitive and very fragile part of a man's body. Applying too much pressure to the testicles will cause immense amounts of pain. This does not mean to stay away from them; it just means to be very gentle. To really get your man going, fondle his testicles gently in one hand. Even more erotic and far more appreciated is to lightly suck or lick the scrotum (try getting one or both testicles in your mouth and humming).