Sex education for first graders in China

Chinese kids are starting early these days. Someone over at the PCPop.com forum with a nephew attending first grade looked through his textbooks one day and was shocked at what sex education for first graders looks like in China these days — funny cartoons, witty dialogues, testicles that talk to one another, and cool-looking Mr Condoms wearing shades. We wish sex education was this fun for us when we were growing up. No, wait a minute, we don't remember getting any form of sex education back then.

ChinaSmack offers a translation of the sex education materials and what commenters are saying here. Can sex education be too early? And if not, should first graders really be learning about condoms? Your thoughts?

NOTE: Some images may not be safe for work (oh the irony)