Not a doctor, but my human sexuality professor in grad school had some interesting stories. He worked a lot in very conservative Christian communities and so a lot of times people got married with no sex education. One couple was in therapy because neither one of them enjoyed sex or ever had an orgasm. After having them talk through step by step what they did in bed, he learned the guy was just sticking it in and nothing else. He told the guy to move back and forth next time and see what happened. They couple came back one more time to say "THANK YOU!!!!!" and didn't need any more sessions.