Sex puts you to sleep.

No matter how exhilarating the romp, you still want to conk out as soon as you roll over. There are about as many theories for why this occurs as there are positions that get you to that state. One of the most recent explanations comes from researchers in the Netherlands who study men's brain activity in a PET scan before, during, and after orgasm. What they've found: During orgasm, there's a tremendous shift in blood flow throughout the brain. About 70 percent of the left side, which is involved in decision-making, is devoid of blood flow when you climax. "With less blood flow, you can't activate as many neurons and this can make you feel sleepy," says Irwin Goldstein, M.D., director of sexual medicine at The Institute for Sexual Medicine in San Diego.
Chemically speaking, there's also a tremendous release of endorphins right after ejaculation. "The endorphins are the natural equivalent of morphine," says J

Your penis is sore.

As long as it's a short-lived, sharp pain that only lasts a couple of seconds or minutes, then it's likely normal and nothing to worry about. "If you ejaculate forcibly, the muscle contraction can cause some pain," Dr. Schiff says. You can release as fast as 25 miles per hour—not exactly a Maserati, but impressive nonetheless. If the pain lasts longer, like a few hours or a few days, you may have an infection in the testicles, epididymis, prostate, or urethra, or a sexually transmitted disease. Visit your doc to rule out any serious issues, and most likely receive a prescription for an antibiotic.onathan Schiff, M.D., assistant clinical professor of urology at Mount Sinai School of Medicine in New York. "They give you a very relaxed feeling, slow down your brain waves and cerebral functioning, and make you feel pleasantly tired." Sweet dreams, indeed.

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