tbh kittens, the idea that penis = rape is one I often interpret from a 'radfem' perspective.
Penises do not choose to rape. The man makes that choice. Rape/DV etc is a choice. Every time. And yes, men are capable of not making that choice. Just about every rape myth going blames the victim because men are so bloody reluctant to 'fess up and admit that even with the biggest boner, they can choose to walk away, and not even feel aggrieved about doing so.
I really do thank God for my old Granddad because he was the one who sat me down one day and had the same talk with me he had with my mum, which was tell me exactly that.
As a kind of lighthearted (and to lighten the mood here a bit perhaps) description of what I mean, you could do worse than watch 'Robin Williams Live at the Met' (1986). At around 27 (ish) minutes he riffs on this relationship between a man and his penis. Its sooo funny (it was one of his best stand up's), but it illustrates how essentially we have all 'othered' the penis as something independent of a man.
There does seem this overwhelming sense sometimes that radfems have wholly bought into the idea that men are utterly incapable of making any choices once his body reacts in certain ways. However, as I have earlier pointed out, both the use of 'libfem' and 'radfem' on this discussion are both hazy undefined terms given that - as I mentioned on my previous comment - these are umbrella terms for a wide variety, in both camps, of different feminist disciplines. And I think the one thing that we can all agree on is that any transformative justice for victims of rape/dv etc has to be rooted in men collectively taking responsibility, given that there is this whole culture of myths that are all about blaming the victim.
(Just quickly - somebody a couple of pages back challenged my use of the word 'theology': I originally (I think) used theology/theory. But both are correct, since Christian Feminist and Muslim Feminist theologies are both things that exist. There are Christian Feminists, for example, who have done a lot of work in the field something called 'purity culture' in conservative Christian cultures, and continue to do so. Queer Christian/Muslim Feminist theologies are similarly both also a thing. )