i dont freaking know, but thats what im trying to figure out as well, except for my lips go numb along with my hands i researched a little and some say it may be just anxiety like a panic attack - deeper breathing creating too much oxygen in your system and not enough carbon dioxide
but continuing on that ove only had sex twice and its happened both times, but im completely comfortable around my boyfriend and wasnt nervous whatsoever either time so i dont think its the answer to my problem but maybe itll help you.
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