The overall idea is mostly right, but it needs a bit of nuance so it doesn’t come across as misleading.

First, not having sex does not harm your body or cause any medical condition. People can be completely healthy—physically and mentally—whether they’re sexually active or not. There’s no requirement for sex in order to maintain basic health.

What can vary is how it affects someone’s well-being, depending on their personal needs, lifestyle, and relationships:

Stress levels
Sex can trigger the release of endorphins and oxytocin, which may reduce stress and promote relaxation. But it’s just one of many ways to get that effect. Exercise, social interaction, sleep, and hobbies can provide similar benefits. So if someone isn’t sexually active, it doesn’t automatically mean higher stress—it just depends on what else is in their life.

Immune system
Some small studies have found links between moderate sexual activity and certain immune markers, but this doesn’t mean abstaining weakens your immune system in any meaningful way. Factors like nutrition, sleep, physical activity, and chronic stress have a much bigger impact on immunity.

Emotional connection
This is where the biggest difference can show up—but it’s not about sex alone. Physical intimacy can strengthen bonding in relationships, but emotional closeness can also come from friendships, family, and other forms of connection. People who feel fulfilled socially often do just as well without sexual activity.

Bottom line:
Sex can be a positive part of life for many people, but it’s not essential for health. What matters most is overall balance—emotional support, physical health, and a lifestyle that works for you.