Advice coming out

Lu

I am demisexual and demiromantic. I only label myself as demisexual not asexual because I can see myself MAYBE doing that in the far far future but it is highly unlikely. I feel like I need to explain this to my boyfriend. He has never said or hinted anything related to sex before and I don’t know where he stands on the subject. I feel the demiromantic part will be easier but I wanted to know if anyone had any advice for coming out to your boyfriend as demi or asexual?