Yes, unless court ordered otherwise. see link
...? Rephrase, this might as well be Hebrew for all I know.
My parents relied on sex ed at secondary school.
There is no rule against it and it all depends on the person if its accepted. Example, some parents don't care and put their kids on birth control so they accept them having sex. Others are not too reasonable. ~Valounda~
It is OK to date anyone you like, as long as you are an independent adult, or your parents permit. Going beyond dating into sexual activity is another matter. Cultures differ in how distant a relationship is required for sexual activity between adults to be acceptable. No modern cultures accept sex between siblings, but some accept sex between first cousins, and almost all accept it between second cousins.
parents have sex when they have kids because its fun to them.
They use their hearts and their heads and they happily accept it. Others do not.
If you meant to say sexual orientation, then it means to which sex a person is attracted to. If it's a member of the opposite sex, that means the person is heterosexual and if it's a member of same sex than that person is homosexual.
All of the studies done in the past 25 years have shown that there is really no difference between parents of the opposite sex and parents of the same sex. Arguments against same-sex parenting are almost entirely religious in nature.
A parents sex chromosomes hold DNA. A parents DNA is passed onto the child.
anal or oral copulation (sex) with a member of the same or opposite sex
The gender or sexual orientation of the parents do not affect parenting skills. There is a full spectrum of parents, from lousy ones to excellent ones, in both same-sex and opposite-sex marriages.