men are a lot harder to please orally than women, on average.
I can barely really enjoy recieving oral, even though its great, sometimes it just doesnt work.
A great way to finish off, and have a great session is just to take an hour or few (yes, he said few) and explore what you like and what doesnt work. Work it up slow, and once you find a few things that work (yes, dont stop after youve found one) then work on 'em.
Everyone seems to have different preferences as to what they like positionwise, so you'll really need to work it out with your partner together sometime.
Take some time. Took my lady and I 6 months after we started having sex to get it so we knew -exactly- what the other wanted and how.
Of course, now, its to the point where she can hit O without even taking her clothes off or putting anything inside... oh what a wonderful achievement