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tubes of spongy erectile tissue, whose proper names are corpus cavernosum and corpus spongiosum . When arousal triggers an erection, these tissues fill with blood, hardening the shaft and head of his penis. However, an erection does not always indicate whether a man is aroused; he can be perfectly, happily aroused and remain unerect.
    At the tip is where you’ll find the head, or glans. The head has the largest concentration of nerve endings in the penis, and it can be very responsive to stimulation—sometimes extremely sensitive to touch (especially after orgasm). Always ask your partner what level of stimulation works for him at any given time with the head of his cock, because his preference levels will change throughout the pleasure cycle. The head is often bulbous—anywhere from slightly to quite pronounced. If he’s uncircumcised, in its soft state the head will be covered in a thin jacket of skin called a foreskin. As his penis becomes aroused, the glans will harden and emerge. In North America, most infant boys are circumcised, a process in which the foreskin is removed after the bundle of joy is delivered.
    Beneath the head of his cock is usually the most sensitive part, which some men claim is their “sweet spot,” the spot they really enjoy having touched when they’re aroused. This spot can range in location from just at the urethral opening to farther down the underside of the shaft, where the circumcision scar lies. On an uncircumcised man, this spot runs along the same area, beneath the tip of the cockhead, from the urethral opening (underside) to approximately where the inner skin of the foreskin’s hood meets the outer skin of the penis.
    Cut or Uncut?
    Most American men have circumcised penises, meaning that the foreskins were removed from their penises shortly after they were born. The foreskin, which they no longer have, is a thin jacket of skin that covers the head tightly, like a wetsuit, with an opening that allows urine to leave the body. When an uncircumcised man is aroused, his cock stiffens and the head swells, emerging from under the hood of the foreskin, which often—but not always—retracts.
    On an “uncut” penis, the outer surface of the foreskin consists of skin similar to that on the rest of the penis. Inside the foreskin is an inner layer of very sensitive, moist mucosal tissue, similar to the skin of the inner labia in women. Connecting the foreskin to the penis is the frenulum, which is where the foreskin is cut away during circumcision. When aroused and stroked by a hand, a mouth, or anything else pleasurable, the foreskin is mostly retracted but slides up and down pleasurably on his frenulum, a sensation many men consider exquisite.
    Some people are nervous about going down on uncircumcised men. Most of this anxiety comes from not understanding what’s different about having a foreskin—if you have not seen an uncut penis before, it might look different from most others you have encountered and even appear to respond differently. If your partner is uncircumcised and you have concerns about how to stimulate him, ask. He’s probably been asked before; even if he has not, he would probably love the chance to tell a lover who cares enough to ask exactly how he likes to be touched. Another concern people might have when first encountering a foreskin is cleanliness—how do guys get it clean in there? Most uncircumcised men learned at an early age how to pull back the skin in the shower and apply soap and water. But if you’re really worried, then suggest a shower together, and you can delight him with your inquisitive and arousing washing techniques.
    The Testicles
    Underneath the penis is where we find the scrotal sack, containing the testicles (or testicle—not all men have a pair). These are the “balls.” Their wrinkly, fleshy container, the scrotum (or scrotal sack), hangs attached at the base of his penis and can be the same color as the penis or darker in tone. With