Bryan Johnson Tracks Girlfriend’s Clitoral Blood Flow: What Can It Reveal About Her Cardiovascular & Sexual Health

Erections are a Tier-1 health marker. In men, ED typically shows up 2-5 years before heart symptoms. It's one of the best signals I have for my health. Women have erections too. This is news for most women. The clitoris is erectile tissue, same as men. During REM sleep, blood flow spontaneously increases. This is a non-sexual, normal sleep function. I have 4-5 erections per night. Averaging 3+ hours. We will see how many @_katetolo has. My erection device costs $275, is wireless, and scores each erection on my phone. This is Kate’s erection setup. + 5cm probe + light with a sensor + costs $15,723.68 Hers is lab equipment, it runs through a wire taped to her leg, into a machine and streams into a laptop that cannot be allowed to fall asleep. Nighttime erections are downstream of whole body health including blood vessels, nerves, hormones, sleep stages, stress, glucose, and cardiovascular health. This is one of 1,900 biomarkers she’s tracking across her menstrual cycle.

— Bryan Johnson (@bryan_johnson) October 9, 2026