Boyfriend sends me porn

This guy I’ve been seeing for two months has sent me two porn videos, first of a couple having sex at a bus station (to which I replied wtf are you sending this to me when I’m at work) and just today a video of a woman masturbating in her car.

It really bothers me that he sends this to me, unsolicited and when I respond asking “why are you sending this to me” he says “so you can see how she does it so you can adventure on your own”

I am not saying there is anything wrong with porn - I am saying that i find it strange and uncomfortable that we’ve never talked about porn, never watched it together, and then I randomly get these videos. Both times he didn’t understand why I was weirded out by him sending the videos. I fretted for two hours about what to respond and finally I told him I was very uncomfortable. He said to disregard it and that he was sorry and that was the end of the conversation for tonight.

There’s still tension in the air...what is making me feel so weird about this? I can’t verbalize why I am feeling strange. But this should be addressed. Any advice?