If you never faked one, then don't start now. It's a slippery slope!
If he cares a lot about it.....then he SHOULDNT be very frustrated!
And your frustration doesn't help the situation.

Have you been down on him? Now let him do the same for you. Talk to him. Tell him. Explain things, before you even get to the bedroom bec stress is such a mood killer!

And don't do anything to just "please a guy", it lowers your status as a partner & a woman.