To answer your question, hormonal changes at age 37 for a woman cause her to have an increased sex drive. Meanwhile, at around 40 years old, many men have dropped in their testosterone, which lessens their sex drive. When testosterone drops, men can still have a strong sex drive, but they are no longer turned on purely by perception, i.e. visual fantasy. A younger man can get immediately turned on by looking at a picture, or even a naked statue. That changes over 40, after midlife.
Men require more romance and physical touch to become fully aroused.
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