Why do my hands get extremely weak when i think about certain body parts?

when people mention certain body parts (anus) or talk about touching parts of their body that are not normal (same, or scrotum, or female parts) my hands get so weak i can’t hold anything or barely even type this out. they get weak like tingly and i have to shake them to regain some feeling or control. the weirdest part is that i feel NOTHING like im goof to pass out, or get light headed or dizzy at all…just the hands. it’s annoying and it make me feel like, idk the equivelant of a weak stomach, except in my hands. it happens when it’s something im uncomfortable with doing (usually on my own body) is mentioned. and it can take up to 15 minutes before my hands feel normal again!