the National Survey of Sexual Health and Behavior (NSSHB). Conducted by a team of researchers at The Center for Sexual Health Promotion based at Indiana University, with funding from Church & Dwight (the company that brings us, among other household products, Trojan condoms), the NSSHB represents the largest nationally representative survey of sexual behaviors conducted in the U.S. since 1994, and in many ways a significant leap in sophistication and specificity in terms of what we mean when we talk about sex.
via Largest Survey of American Sexual Behaviors Offers Snapshot of 21st Century American Sex.