Jimmy Neutron

Sex & Nudity
Mild flirting and obvious romantic tension between young characters.

A few short and sweet kisses from time to time.

There is an episode about pants that have own minds, so the characters are in their underwear.

In N-Men episode there an upskirt

Violence & Gore
Relatively mild (but sometimes more intense) cartoon fantasy violence and mischief (i.e. hero vs. villain, etc), although you should note that there is rarely any deaths or serious injuries.

Profanity
None.

Alcohol/Drugs/Smoking
None.

Frightening/Intense Scenes
Frequent cartoonish action sequences are (for the most part) pretty mild, while others are a bit more intense and serious.