I think it does feel more intimate personally, because there are no boundaries. I was thrilled when my wife went on birth control back in college so that we could do that (until the birth control eventually began killing her sex drive, and then it wasn't really worth the trade off).
There is also a territorial aspect in a way I think, of a guy leaving his "mark" on a girl. When we were still dating in college and my wife and I got back together after a break up and eventually admitted she had been with someone else, it came out that their first time he had gone bareback and cum in her, completely unprotected with no birth control or anything (she got VERY lucky nothing happened as a result). Since I had never cum in her or not used a condom ever, and didn't for a long time after that, there was definitely this strange feeling that another guy had full, unprotected access and use of her pussy well before I ever got to, like he was the first guy to actually "mate" with her in the animalistic sense, and even when I finally did get to finish in her, she was on birth control so it was still protected in that regard.