I need advice on how to

Okay so in this field, I consider myself an expert. I'm a Male who fancies a good prostate massage.

First off, it is difficult to stimulate the prostate well. I have even bought toys designed as prostate massagers that still don't do the job for me. So it takes practice to get it right.

Make sure he is sufficiently aroused first. The prostate enlarges when aroused and this will make your job 1000x easier. Not only will it be easier to reach but it will be more sensitive so his feedback will be better.

The prostate sits roughly halfway between the anus and the testicles so what that means is that when you finger him your finger should be curving towards his front.

So my fav position for this is have him lie on his back and then bring his knees to his chest and gently hold his thighs apart. Then finger his bum while curving your hand upwards.

It will likely be deeper than you think but idk it might just be me and my deep prostate. Most importantly, get his feedback as you go!