why is the bulbospongiosus muscle important?

Hi all - slightly unusual title, i know.

When I am abstaining, I get waves of urges lasting about 5 - 10 minutes. During these periods I get a strong tingling on the underside of the penis at the base - ie where penis meets balls. It is actually more of a spasm, like a twitching muscle. So I researched this and it turns out the bulbospongiosus muscle lies in the exact location where I get the tinglings. if i gently place a finger on it, i can actually feel the muscle contracting and going wild.

This is not a painful experience at all, it just make me want to PMO even more. Has anyone else had similar experience? Hopefully, during my nofap journey the spasms will slowly reduce?