The one question I'm asked pretty much every day as a sex therapist and relationship expert turned neuroscientist is how to keep desire alive. Good news? Cultivating the pleasures of an oral sex orgasm can be a delightful way to ignite and reignite passion over the long haul.In a recent we explored how the juiciest lust-filled type of sexual desire tends to wane after the honeymoon period, fueled by potent brain-chemical aphrodisiacs, fizzles out.