“Nah, your fingernails don’t need a trim. If she can’t handle your adult man’s untrimmed fingernails inside her, she does not deserve to have sex with you.”
Hair that’s long and overgrown can cause problems just like long fingernails can cause problems. Keeping them trimmed so they don’t is just being considerate of your partner.
I don’t know about firstest, but he was definitely firster. That’s why they call him a founding father, not a founding fathest.