From what I gather, this is culturally specific and context matters. Different countries "censor" different things. In the U.S., Will Smith's nude shower scene was edited out of I, Robot but left in for European audiences. This was kind of a shame because it wasn't sexual at all and was a natural way to show the audience his robotic arm, an important plot point that was hard to properly introduce any other way. On the other hand, Linda Hamilton not only beefed up for Terminator 2, she actually learned to pick locks for the movie, something shown on-screen. Great Britain apparently had an issue with showing live lock-picking and that was censored in some fashion in that country.
(Or so I understand it. I am not in a position to look up citations.)