The advantages of addressing different sexual orientations in sex ed are clear, And they've already been stated by the other posters here. We could see better prevention of the spread of STDs, And less alienation of non-straight people on sex-ed classes.
On the other hand, Splitting gay and straight people into different classes in high school would be extremely counterproductive because it forces people to choose an identity, Opening the door for ridicule and splitting the community. Therefore, Homosexual sex ed should only be implemented to the extent that it can be woven into the existing curricula.
Every kid, Sexuality doesn't matter, Should be taught how to safely have sex. They should be aware of the dangers and know about the diseases that can be spread by intercourse and yes for best education it does need to be taught in school, Especially around the age when they are hitting puberty.
In the world we live in now people should be educated in this subject, And well. There are too many people that get sexually transmitted illnesses; and worse people who still have sex knowing that they're transferring them to others without telling them.
It can happen to any person regardless of sexual orientation. Except maybe asexual's, Who have an inherent lack of interest in sex.
There is also a disparity of people who simply didn't have this many genders growing up in the past, And weren't educated on it as a result.
First, Sexual education should be taught for heterosexual people as to know how to prevent pregnancy, Disease, And ensure safety. Same with Homosexual sex, Minus the pregnancy. If people aren't aware, Then it is more likely to happen. If they were informed of possible dangers and precautions they could be taken.
I suppose that "inclusive sex education" means educating children in homophilic sex? I do not think we should encourage people to become homophilics, It goes against human nature, And no I'm not saying that out of a religious "cuz gawd said soo" but because men and women are specifically designed to procreate via sex with the opposite sex, Not the same sex.
I do however think that some sex education is necessary, Though perhaps a bit later than we do nowadays, To prevent the spread of sexually transmitted diseases.
I do not think sex-ed should be taught in schools. There is nothing a person needs to know about sex that they cannot learn from their doctor. It is a wast of schools' time to teach sex-ed, When most of the kids already know the stuff, And the rest are traumatized because they were not ready to hear it. I think that parents should start teaching their kids about sex at an age appropriate level as young as possible, So by the time they are finished with puberty, They have all the information they need. However, There are a lot of sucky parents who won't be able to do this sufficiently, So around age 14 doctors should check in with kids and ask if they know how sex works and if they know how to avoid STDs, Then leave it at that. If kids are not seeing a doctor, They already have more problems then public school can fix, So sex-ed in school is not going to be a whole lot of help for that tiny minority of kids.