whose duty is it among parents to give the children sex education, what age is ideal for the lessons and how does one start?

It is the duty of both parents.
The good thing for the kids is that, they will learn from both parents.
I am sure there are things that Dad would know better than Mom and likewise Mom.

@Fhemmmy,
You said it all!

My mom first gave it to me but thank heavens for my dad coz his version kept me from running the other direction every time a guy looked my direction. Lol!

Both - However the mother has a bigger role!

MrCrackles:

Both - However the mother has a bigger role!

I think bigger role depends on the past and experience of each parent.
Take a case of a father that was a player, he would be able to talk to the daughter about all the style used by guys to get into the pant of a cute babe.

The Mother too can tell of her experience, but i am sure no mother will tell her daughter that she used to "donate" easily, so she will tell the kids of experiences of her friends and people she knows and story she heard.

@poster
it all depend on what kind of relationship that kid has with his parents and how open minded his parents are.

some girls open up more with their mothers on the subject and boys with their fathers just because they have been there before.

but if you talk about DUTY then it is both parents duty to teach their kids about sexuality.

as for the age, some children are quicker than others so some might need their first info around 11yrs old while others around 14/15yrs old (all depending on their social background)

Sex education??

I LAUGH IN SEX EDUCATION.

The only thing my mum told me about sex was: 'The day you bring a girl and a child into this house, that day i'll put a 6 inch nail in your head'.

Dem no born me well to understand where she stand.

Both parents

OMO IBO:

Sex education??

I LAUGH IN SEX EDUCATION.

The only thing my mum told me about sex was: 'The day you bring a girl and a child into this house, that day i'll put a 6 inch nail in your head'.

Dem no born me well to understand where she stand.

That is one of the reasons why kids learn from their friends and often learn the bad things

the duty of those that brought them into the world!

^lol

It's d duty of the father, mother, school teacher, Sunday-school teacher or Imam as the case may be. Grandparents also do a good job in this aspect.