Anti-porn? It's because of the porn
Anti-LGBTQ? It's because it's hard to have sex "when you're not even sure of the gender" of your partner (an actual comment on the Substack)
Parent? It's because less available childcare and more helicopter parenting expectations lead to less alone time
Young adult? It's nihilism about the future and crushing workloads with no way to afford your own home/apartment
Old? It's because people had more sex when "men were men and women were women"
An incel? It's because of women
Feminist? It's because of men
Anti-tech? It's social media
Environmentalist? It's environmental factors
I could go on. But almost anyone could argue for almost any reason, and it seems to be more enlightening about the person making the argument than about the problem.