I do like to give oral too. But I found that some girls dont really enjoy as much as they should. Unlike us a great amount of pleasure they get comes from their emotional state. I mean they may need to feel dominated or in touch with you. During oral is like they feel lonely(if not bored), you are down there like a sextoy. No eye contact, no talking...
For us is different because if we like the feeling then we love it, but they are more complex.
Its ok you like it, but you shouldnt need it.
Variety, thats the secret
Besides, dont ever do oral with ONS because you could get an std.