Bruce Richman of the Prevention Access Campaign introduced the concept of U=U to the broader public when he discovered what scientists had known for years: If you’re on treatment and your viral load is undetectable then you can not transmit the HIV virus.
Backed by science (don’t take our word for it, see our videos with Dr. Anthony Fauci of the National Institute of Health or with Dr. David Purcell of the CDC), U=U means that those with HIV can have full meaningful relationships without fear of passing HIV on.