Wanna put it in his butt

I heard men can have an orgasm through anal so I'd like to try it with my boyfriend. We have a very healthy relationship and we like to experiment during sex but that's something he says he's just not interestes in trying. He says that because he doesn't like pooping he wouldn't like anal lol. I know it's because he's afraid it'll hurt his masculinity. It's the same with licking his nipples. I keep telling him that it's ridiculous logic and it won't hurt his masculinity. I respect his wishes if he doesn't want to try it. I just don't want him missing out on something he could potentially enjoy. Does anyone else have any experience with this or how they swayed their SO's mind?