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We have four or five of these cycles in a healthy night's sleep, and often wake up during the REM phase, which is why men experience morning erections.
If you are considering androgen replacement therapy, talk to a doctor to learn more.
There are testosterone receptors, which bind to the hormone to make it effective, inside the penis so they won't be activated if there isn't enough of the hormone, making it difficult for the penis to become rigid.
Studies show that men over 50 have a longer life expectancy if they have at least two orgasms a month, compared with those who have none, while heart attack patients survive longer if they have frequent sexual activity.
Men who no longer experience automatic morning erections may want to see their GP, especially if it's accompanied by a difficulty maintaining or gaining an erection when aroused.
The refractory phase can vary from one minute for a 16-year-old to one month for a 90-year-old man, but is usually several hours.