The main problem as I see it is that it makes men passive.
Years ago I had a girlfriend who complained about the passivity of men. All these men she found so infuriatingly passive must have already been sexually assaulted before they were sexually assaulted by her, I imagine.
I knew a male friend whose history was all about being chased by women. He never fought for anything and always gave in to expediency. He told me the nurse seduced him when he was an adolescent.
Men and women who have bad first relationships repeat the same pattern of behaviour even though they must have been painful.
It is not even the act itself, but the pattern of behaviour it establishes which is often lifelong. It emasculates men by making them sit around waiting for an older woman to make the move. This means they will probably never marry and never become fathers, content in their passivity.