That’s KIND of like saying the Dead Sea is not full of water.
You miss the salient issue. It is more like saying that murder is not an expression of loving kindness. Sort of like Jeb’s claim that illegal border crossing is an act of love.
This is more than putting a moral judgement on sexuality. It is claiming that sexuality is specific and ordained as an act of intimacy between a man and a woman. Masturbation by this understanding of sexuality as coitus is not sexuality. It is an alternative to sexuality as are pornography and homosexuality.