Nationals MP likens Safe Schools to child sexual grooming

A controversial school program focused on gay and lesbian issues, likened to child sexual grooming by one government MP, is gaining popularity.

The number of schools signed up to the Safe Schools Coalition has jumped to 515 from 490 in just over two weeks and amid a push by conservative MPs to shut it down.

Nationals MP George Christensen says the program is akin to a pedophile grooming a victim because it recommends pornographic content, sex shops, sex clubs and adult communities to school kids.

The program had links to websites that advised kids about chest-binding, penis-tucking and gay sex and gave instructions to children about unblocking websites without their parents' knowledge, he told parliament.

Prime Minister Malcolm Turnbull has been urged to reprimand the outspoken backbencher.

Greens senator Robert Simms, who is openly gay, said the prime minister should condemn the "homophobic comments".

"To compare a program that's about helping young people to 'grooming' is utterly reprehensible - it's profoundly offensive and deeply hurtful."

The Greens are seeking a Senate inquiry into homophobic bullying in schools following Mr Turnbull's decision to seek a report into Safe Schools.