My husband is 27 years old and its been a week that we don't have no sex cus his penis . i don't know how can explain but his penis are asleep?

It depends: Upon the cause. There are many possible mental and physical causes. Things that can help are relaxation, avoidance of toxins such as alcohol/tobacco/anabolics/opiates and certain medications, diet/exercise and weight loss, making sure hormonal levels are normal, etc. Check w/your doctor. At his age, stress and anxiety are most common.

Start: Start by seeing your regular physician. Decreased libido can be caused by decreased testosterone levels, anxiety, depression, thyroid issues, medication side effects, diabetes, and such. See your family physician first who can do a work up and treat or refer you accordingly. Rule out other causes which can be concerning but it could be performance anxiety which is common.