I don’t have that answer after 24 years of marriage and still very much in love. I do feel you and agree on the passion part though so am staying tuned in on this post Incase somebody has the magic answer. Maybe it’s a choice? A choice you make. To start it and then it turns to passion? I don’t know because I haven’t tried. Don’t have the drive to care to 🤷*♀️ I have the love.