Is the relationship otherwise healthy, is he a caring partner, does he listen, do you feel supported, is your sex life ok?

If no - you have other problems and better reasons to leave. Take care of yourself!

If yes - leave it, people are entitled to their little secrets, like their choice in, err, corn. If it helps, the... cobs? Are usually (depends on how good moderation is on those sites, since they will typically purge illegal stuff) mature corn cobs actually. Probably your age in reality. The teen thing is cringe, but if you think this necessarily makes the guy a... seedling lover? ... it doesn't really.

Don't pry into other people's secrets unless you have really good reasons to suspect something harmful or criminal is going on and you're prepared to make an intervention. Nothing good ever comes of it, otherwise.