Not satisfied in bed

I've been with my SO for over a year now, and I love him very much. I enjoy having sex with him, but I'm never satisfied. We only get to see each other once a week, so he doesn't really last very long(was a virgin before he met me). When he does last longer it just doesn't seem like enough. We have talked about it but don't really know many ways to fix it. Has anyone else had this problem? How can we help him last longer? Does anyone have any tips to make it more enjoyable/pleasurable?