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when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

A guy's penis most likely the most used muscle of a guys body

dick,cock,schlongect. the long dangly thing in between his legs... or between a tranny's legs

The Muscles involved in sexual acts/intercorse.

love muscle means your heart

it does not mean penis,

reason one, it is not a muscle (blood is pumped into it when you get a hard on)

reason two, when a person means love people generally say it comes from the heart (or thats where the term comes from "oh i love you with all of my heart")

there is a song on american pie called "love muscle" it is about emotions and feeling not about cock/sex

seriously it is not penis.

the muscle up the vaginal opening used to grip the penis and may become tight