The actual size doesn't make the pleasure. *I think that no matter how big your penis is, if you have good method and foreplay you will both enjoy sex. *There are so many ways to make your partner orgasm, don't worry too much about the size of your unit.
The best sex I have ever had was with my current husband. *We just measured him and he is 6x6. *I have had much bigger/smaller and it didn't feel nearly as good. *It wasn't because of the size of their unit, it was just because they were lousy lovers. *They didn't take the time to find out what I liked and what felt best for me they just assumed they were doing it right(and I wasn't very vocal about it either). *I am a very generous person who enjoys making my partners feel good - I've NEVER had any complaints, only compliments - yet I was left feeling unfulfilled. *
I also was never really into getting oral before I was always just kind of waiting to get to the sex... now I enjoy it more than.... chocolate? *Foreplay is soooo important - don't skip it or rush it. *
My husband and I spent a lot of time telling each other what felt good and made suggestions on what we would like to try. *Experimentation is awesome... don't be scared to try new things! * *

* Everyone likes different things and you just have to find out what those things are.
Sorry to babble, but IMO men spend way too much time worrying about the size of their penis and not enough time trying to be an attentive and passionate lover.