It sounds to me like he was mirroring/rephrasing what you had just said. You were telling him that sex was just primal, and he agreed and called it by a base, "primal" name, rather than something more socially acceptable like makin' whoopee, lovemaking, etc. I suspect there's a lot here to explore in your therapy and T is trying to get reactions from you and bring out some emotion that you can work with.

My T did a similar thing. We both know that someday I'm going to have to talk about my feelings for him, but I keep putting it off. One day when I was skirting the issue, he said, "You know, therapy is all about love." And then used the L word again but I can't remember how. He was saying it first, saying it out loud in the room, to try to make it easier for me to say it. Once it was out there, then it should be easier for me to say it, because I'm not the first one. I think maybe your T was doing something like that??