How many seconds persisting with thoughts of a sexual nature constitute a sin? If it's more than a minute, is it a grave sin? I'm confused and I just want clarification. I'm not trying to discredit you, Joan, honestly, I am genuinely asking for the sake of my soul just in case I receive communion and I have dwelled on matters sexual for longer than Jesus would permit. You've got two weeks to answer then I am going to go public.