Of course it's not but VR porn is a big step from video porn. There will be a percentage of men who will be satisfied by it just enough to wait longer (at 30+ it could become easier for them). Don't you think that this could lower the destabilizing effect?
Its because relationships, both casual and long term, are usually more than about sex. And even purely sexual ones... its not just orgasm that makes sex good. Its everything before and after sex, too. Its the ecstasy of sharing your most vulnerable self with _another human being_. And also the uniqueness of every experience.
It may be possible that a sufficiently advanced AI and advances in robotics may be sufficient for what most people think of sex though, IDK.