Question on prostate stimulation

Gentlemen, I'm a middle aged straight guy looking for some help. Apologies if this is the wrong sub.My wife is not open to any form of internal stimulation to my prostate. Not with her fingers, butt plug, or anything at all. She has been trying to do it externally, but it just isn't working.I have never tried it internally, and haven't had any noticeable success stimulating my prostate externally. Even trying it through masturbation many many times. I just can't seem to find the sweet spot.Do you have any suggestions?I really appreciate any help you can offer. Thank you.