I’m not a biologist, but I was told by a dating expert that it’s not entirely implausible that it is to entice sexual partners and temporarily increase sexual attraction for a “morning mating session”. I like this theory because it also explains why morning wood is a thing. Maybe we are meant to be humping in the morning and not at night?
Its because your sympathetic nervous system has low activity and your ventral nervous system is active. This can also be translated to: you feel relaxed and safe.
That’s why when you are scared your voice becomes tiny because your muscle tense up (also the ones surrounding your throat) and it becomes hard to relax because of the overactive sympathetic nervous system.
Read about the polyvagal theory if you wish to learn how to understand and better control these systems. Eg. become relaxed and have a deeper voice.
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