Don't sweat not cuming during intercourse. Many woman do not.
Have you tried having your lover rub your clit with his finger
while inside you....best done lying on his side or missionary?
Another way I have found works great is to eat my lover until she comes and then enter her and have sex for about 10 or fiftenn minutes and then pull out and eat her again until she is nearly ready to cum. Then I re-enter her and I will cum soon and quite often she will too. I have used this techinique on several women.