Desire After 40: The Brain Science of Women's Libido and the Return of the 'Switch'
Entrepreneur Cindy Eckert and Dr. Vonda Wright discuss why sexual desire can fade for many women after 40 and why it starts in the brain, not the body. They cover the science of HSDD, a non-hormonal option now approved after menopause, and the cultural double standard that made the journey harder than the science.
Overview
In this episode of the Dr. Vonda podcast, orthopedic surgeon Dr. Vonda Wright sits down with entrepreneur Cindy Eckert, founder and CEO of Sprout Pharmaceuticals, to explore why sexual desire can fade for many women after 40. Eckert recounts how the first brain-imaging data on low libido led her to spend a year simply listening to women, who described being repeatedly told their loss of desire was 'all in your head.' The conversation distinguishes desire, which begins in the brain's reward center, from arousal, which is about blood flow to the genitalia — a distinction long overlooked in women's health.
Eckert explains the science behind Addyi, a non-hormonal medication that acts on dopamine and serotonin to promote interest rather than suppress it. Women often describe the return of spontaneous thoughts and fantasies as the first sign of change, building gradually over weeks.
HSDD can affect women from 18 to 80, and the treatment has now received FDA approval for post-menopausal women. Much of the episode examines the cultural double standard that made this journey harder than the science itself. Eckert and Wright close by giving women concrete language to lead medical conversations with their biology and to seek a second opinion when they are dismissed.
Key quotes
5It wasn't the science that was hard. It's what the science had to survive.
I'm missing something I used to have. It's like the switch went out at some point and I can't get it back, but I want to.
It's like having a numb finger. You can still feel a pressure. You know it's supposed to be there, but it's not there.
We need to have important conversations about sexual health.
Take me seriously on the basis of my biology. Then we'll explore everything else.
Key ideas
9Desire lives in the brain's reward center
There is a reward center that drives appetite for sex, and for many people that balance shifts over time. Desire is a brain event, not simply a matter of willpower or effort.
Medical gaslighting is the common thread
After a year of listening, Eckert found women of every age and life stage shared one experience: being told their lost desire was normal, in their head, or fixable with lingerie or a bubble bath.
'The switch went out' — the language of loss
Women repeatedly describe an absence, a dullness, or a switch turning off. They often begin by saying they love their partner — this is about them, not the relationship.
Desire and arousal are different physiologies
Arousal is blood flow to the genitalia, the focus of men's medicine since the blue pill. Desire ignites in the brain, and it is the conversation that had rarely been had for women.
How Addyi works on brain chemistry
The non-hormonal medication acts on dopamine and has a distinct effect on serotonin — unlike many antidepressants, it promotes interest rather than inhibiting it.
Restoration shows up as returning thoughts
Effects build gradually, separating from placebo around a month in clinical trials. The first sign is often the return of spontaneous thoughts and fantasies that had disappeared.
Desire is part of wholeness, not just an act
Losing access to desire can spill into confidence and identity. Eckert frames sexual health as the next conversation in longevity, alongside physical and mental health.
HSDD appears from 18 to 80, and is non-hormonal
Clinical trials included women aged 18 to 80. Because the mechanism is non-hormonal, it can be used alongside hormone therapy or when systemic hormones are contraindicated.
A cultural double standard, not a scientific one
Products for men are celebrated for vitality; options for women are framed with warnings. The data never moved — the real question was why a double standard existed at all.
Practical takeaways
6- 1
Lead with your biology 42:30
Bring a clear, prepared script to your doctor: describe persistent, distressing low desire and ask to be taken seriously as a biological matter before exploring anything else.
- 2
A second opinion is always okay 44:30
No good clinician is offended by a second opinion. If a provider dismisses you, it is fine to ask for a referral or change clinicians.
- 3
Give any option time to build 23:00
Like a GLP-1, effects accumulate in the system over weeks rather than appearing overnight, so patience matters when acclimating.
- 4
It can work alongside hormones 33:00
Because it is non-hormonal, it can complement hormone replacement therapy or serve as an option when systemic hormones are not suitable.
- 5
Use a discussion guide 45:30
Printable discussion guides and reputable medical resources exist online; bringing one into the appointment can lower the barrier to starting the conversation.
- 6
Distress is the criterion 35:00
If low interest does not bother you, treatment is not needed. The clinical picture involves low desire that has persisted and is causing personal or relational distress.
Topics & chapters
15Cold open: the reward center and gaslighting
Eckert introduces the brain's role in desire and the pattern of women being told it's all in their head.
Welcome to the Dr. Vonda podcast
Wright thanks the audience and frames the episode on women's sexual health and agency.
Cindy Eckert, Sprout Pharmaceuticals, and the movie
Wright introduces Eckert's journey and the film made about her story.
Listening to women: 'the switch went out'
Eckert describes spending a year hearing how women lost their desire and were dismissed.
Desire begins in the brain, not arousal
The conversation separates brain-based desire from blood-flow arousal.
The words women use
Absence, dullness, numbness — and love for a partner that remains intact.
The science of Addyi
How the medication acts on dopamine and serotonin to promote interest.
How restoration shows up over time
Returning thoughts and fantasies, building gradually rather than overnight.
Desire, wholeness, and a sexual health revolution
Why desire matters to identity and the future of medicine.
HSDD across ages and non-hormonal design
From 18 to 80, and how the mechanism differs from hormones.
FDA approval after menopause
Closing the gap for peri- and post-menopausal women.
What was the FDA protecting? The double standard
Cultural resistance, gender disparity, and risk-benefit hypocrisy.
How to talk to your doctor
Concrete language to lead with biology and avoid being dismissed.
The Pink Pill and gender disparity in medicine
The film as a case study of double standards in medicine.
Agency, the conference, and closing
Sharing knowledge woman to woman and Eckert's continued advocacy.