useless trivia: What Word Means: Amusing?

Questions

medical researchers contend that no disease ever identified has been completely----------?

every year, ---------- americans injure themselves while trying out bizarre sexual positions?

every year, 11,000 americans injure themselves while trying out ---------- sexual positions?

in the u.s., there is, on average, ---------- sex change operations per day?

more than half the american men surveyed in a recent poll admit to having sex with women they----------?