I'm curious about what data suggests this, since getting honest answers about sexual activity from the public is a famously difficult challenge.

As an entertaining example, Seth Stephens-Davidowitz's big data book Everybody Lies mentioned a study that asked people in the United States how frequently they had sex, and how frequently they practiced safe sex with a condom. If the resulting data was accurate and projected across the entire country, the United States consume 2.7 billion condoms a year... even though only 600 million condoms are sold in a year.

https://www.theatlantic.com/health/archive/2017/06/our-searc...