How to improve sexual skill (man's)

Well...this question is a little awkward but what is a good sexual skill to you? I've only been sleeping with one guy and never had a vaginal orgasm ever (with him or with toy). I can feel the pleasure very often and get really wet though. How do you define a good sexual skill and how my SO can improve his? (Hope this is not tmi: his size, hardeness and duration are all perfect for me and we kiss and touch each other during sex also)