Sex at his friends house

So the guy Ive been seeing watches his friends dog every day. He invited me to come meet the dogs and hang out at his friends house for a little. We played with the dog and then he initiated the foreplay as we were on the couch. Mind you, I’m 19 and he’s 26. He wanted to have sex in his friends bed. I said HELL NO. I don’t know this person so it’s not happening. He kept persisting because “it’d be funny to tell his friend he had sex in his bed.” We never did it but he was seriously mad about it. I think I’m the mature one here. Anyone else go through this situation. Y’all might think I’m uptight or something or no fun but I did not think this persons house was clean.. soo.. yep that’s my story.