Having a conservative nature, Pinoy parents tend to shy away from topics about sex. What do you think is the right age for kids to have proper sex education?

I was also introduced to sex, particularly the reproductive system when I was in grade 5-6. At that time, we were old enough to somehow grasp what was being discussed, but of course there were still a lot of questions in mind. It should be a step by step introduction, depending on the age and ability of the child to understand each specific topic about sex.