??? Suggestions

My husband has never really enjoyed sex. So I have been on the hunt for ways to make it better. I came across the prostrate orgasm. So I have been slowly working my way to that ( he wasn't against it he is just extremely ticklish so it is hard for me to touch him) . Well, I finally got back there and was able to give him a better orgasm. Now tonight I go to give him a BJ and he directs my hand there again. This time I added the bullet vibrator and he went crazy. He has NEVER moaned or shook .... that changed tonight.

Anyway... Now I am looking into getting him a toy. I don't want to be using my vibrator as I know crossing bacteria from the back end to the vagina is not good. So my question is.... what toys do your husband's like (or you as men) He isn't really sure about having something in him so I am thinking more of an external thing or a very small internal toy that I can use on him when we have sex. I really want to feel him orgasm like that while in me.

Thank you in advance. I will not be responding unless I can edit this post as I wish to stay anonymous.