Never notice precum

So I noticed my boyfriend doesnt produce precum like my exs. When i jerked them off or given them head i would notice precum but with him. Nothing. Then when I mentioned it to him he said it does happen just later. So for instance today we had sex. I noticed no precum. But as soon as we were done all of a sudden he produced precum. But it made me wonder if its coming out during sex. Because today was the first time I saw precum after sex. Has anyone had or is having this experience?