"Semi-Pro" is a goofy Will Ferrell sports movie, but it is NOT "Blades of Glory" or "Talladega Nights."
Those movies were PG-13, and somewhat raunchy. "Semi-Pro" is a hard "R," and it's very raunchy. You don't want preteens - a major Ferrell constituency - anywhere near this movie. "Semi-Pro" contains widespread use of obscene language, and there is sexually explicit content.
If the movie's R-rated nature has snuck up on you, that's understandable. For months, the "Semi-Pro" ads have been running with a disclaimer that says "this movie is not yet rated."