Correlation ≠ causation The stress men seem to be experiencing is from the build up of sexual energy. Stress isn't the only way that this energy build up manifests.
But isn’t stress from the build up of sexual energy still stress?
We experience stresses everyday. Waking up is a stressful event. A man can transmute this sexual energy into purposeful action & drive. Ironically, this tends to make his partner pretty horny. It's generally when the man can't find a purpose that he experiences the frustration of it. He then seeks to offload this energy & find relief from it.