Some have sex with people of the opposite sex. Some have sex with people of the same sex. Some teenagers have sex with both.

(Some teenagers don't have sex at all, and that's fine too.)

The Australian Christian Lobby has ramped up its campaign against national body the Safe Schools Coalition.

The opt-in program receives federal funding and is delivered into primary and high schools throughout Australia at each school's request.

Safe Schools aims to stamp out homophobia by offering schools training and resources linked to supporting lesbian, gay, bisexual, transgender and intersex students by creating a more inclusive environment.

It's an important and crucial aim. Three-quarters of people who identify as LGBTI have reported feeling vulnerable to prejudice and discrimination, and homosexual and bisexual Australians experience anxiety disorders at double the rate of their heterosexual counterparts.

The Australian Christian Lobby has argued that Safe Schools is not an anti-bullying program, but a promotion of ideology at the expense of the welfare of children.

In a briefing sent to parliamentarians, the group has referred to content endorsed by the Safe Schools Coalition which shares stories and advice for young LGBTI Australians.

Included in the resources written by Minus18 are instructions on how people can safely bind their chests, discussion of the difference between sex and gender and tips on coming out to family and friends.

The Australian Christian Lobby has argued that this material radically sexualises young people and demanded the federal government drop Safe School's funding as a result.

"Bullying for any reason is wrong and should be combated, but teaching primary school students about queer sex and cross-dressing without parental permission is not the way to do this," ACL spokeswoman Wendy Francis said earlier this year.

But Safe Schools is not a sex education program, nor is it about sexualising anyone or anything.

It is a program aimed at providing exactly what its name suggests - a safe school environment for all Australian students.

Safe Schools Coalition Australia program director Sally Richardson put it best when she pointed out that campaigns like the ACL's hurt the very people they were trying to help.

"The people who are most harmed by it are the young persons in schools," Ms Richardson said.

"These views are sensational and above all, the people writing this material have lost touch with the fact that the health and wellbeing of a young person is the most important thing."

Whether we talk about it or not, young people will be attracted to the people to whom they are attracted. Some will have sex. They might identify as a gender different to the one they were assigned.

Homophobia and transphobia are real. They claims lives.

The least we can do is support our young people with the information they need to make responsible decisions in a safe and supportive environment.