What is libido — and why does it fluctuate?

Have you ever noticed that your desire for sex has just... disappeared? Or the opposite — that it suddenly returned, stronger than it's been in a long time? You are far from alone. Libido is one of the most human phenomena we know, and yet it's something many of us carry in silence — with confusion, shame, or worry. But libido is neither a problem to be solved nor a goal to be reached. It's a signal. And it tells us something important, if we're willing to listen.

What is libido, really?

The word "libido" comes from Latin and simply means "desire" or "longing." In everyday language, we use it to describe sexual desire — the inner drive that pulls us toward intimacy, closeness, and sex. But libido isn't just a matter of hormones and biology. It's an interplay between body, mind, and relationships.

Biologically, hormones such as testosterone and estrogen play a central role — and that goes for all genders. But research shows that psychological and social factors are at least equally important. American sex researcher Emily Nagoski describes in her book Come as You Are libido as a system made up of two parts: an "accelerator" (what ignites desire) and a "brake" (what extinguishes it). In many people, the brake is far more active than they realize — and that has consequences for desire, even when the body is actually ready.

Why does libido fluctuate — and what affects it?

The short answer is: a great deal. Stress is one of the most common causes of low sexual desire. When we're in constant survival mode, the body prioritizes survival over reproduction — and desire quietly retreats into the background. The same happens with sleep deprivation, anxiety, and depression.

But libido also fluctuates completely naturally throughout life. Pregnancy, menopause, hormonal shifts during the menstrual cycle, new medications — all of these factors can significantly affect desire. And then there's relationship dynamics. Research repeatedly shows that insecurity, unresolved conflicts, and a lack of emotional connection are among the biggest libido-killers in long-term relationships.

Finally, our inner life — our self-image, any past traumas, and our relationship with our own body — has an enormous influence. It's hard to desire closeness when you don't feel safe within yourself.

What can you do when desire fluctuates?

The first and most important step is to remove the judgment. Libido is not a benchmark, and there is no "right" level. It's about what feels meaningful and good for you — and possibly your partner. Conversation is often the most direct path: daring to say out loud what's missing, what ignites desire, and what's causing concern.

If you notice that low libido is persistent and affecting your quality of life or your relationship, it may be a good idea to speak with your doctor to rule out hormonal or medical causes. Couples therapy or sexological counseling can also open doors you didn't know were closed.

Libido is not a constant — it's a current that moves. And movement is a sign of life.

What do you think has the greatest influence on your own desire — and is it something you've ever spoken openly about with a partner or someone you trust?