Our expert says:
During the night the man's body does something like "body checks" including blood flow to the penis, the body also has a peak in certain hormones in the morning that add to the occurrence of morning erections. They are common and normal in men.
The fact that they are firmer than erections obtained during sex may be linked to that they are spontaneous, not linked to sexual performance i.e. unconscious and thus firmer.
Increasing intensity of erection firmness during sex would involve exploring what kind of stimulation really turns on your partner and that he is relaxed and does not have performance anxiety. Also make sure he has no medical conditions or takes any medications that could affect his erections.
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