What is the best way

what is the best way to suggest a prono to m boyfreind so I don't sound like weird

Iniciate the subject somehow. Ex.: Next time you are having a conversation about sex, try to bring up the subject of pornography. Maybe start by asking him if he has ever watched porn, etc. then share your views on porn and tell him that you want to watch some with him. Tell him your curious and that it is something you'd like to try with him. Most guys are open because they like porn. I don't think he'll find you weird maybe just different because the conception is that most girls don't like porn (which is absolutly not true).

buy a movie you are interested in watching, and show it to him. Most guys will be all for it.

dont worrie almost all men would be all over it