Large anal insertions causing parial erectile disfunction?

I'm 32 and otherwise in great health/shape. I use objects in the 3 to 4 inch diameter range and I'm worried that I'm putting too much pressure and friction on the prostate gland. I'm worried that it might be leading to my parial erectile disfunction. I typically don't feel sweeling or pain in the prostate after a large anal insertion. I know the much more likely explanation is that because anal insertions produce a much higher level of sexual stimulation, I'm unable to get hard in normal circumstances. Mind you I'm talking about getting an erection while nothing is in there: I know the blood flow is pretty cut off when something is in there. Also, what I'm really asking here is whether large anal insertions can cause prostate damage.

Well,

If you want to fully enjoy in this way of anal stimulation you have to be prepared for the certain risks. Insertion of foreign objects into the anus is not without dangers and you are aware of this otherwise you wouldn’t be posting this question.

This area is very fragile! The intestinal walls do not feel pain and sometimes you can injure yourself without realizing it. Unsafe anal masturbation can cause harm and even get you to the hospital but since you are practicing this for a while you are probably aware where the borderline is.

You can increase safety of the anal masturbation by ensuring that the bowel is emptied before you begin. As well using large amounts of lubricants is essential to avoid injuries and the inserted object must not be too large and your prostate is safe.