Here's another similar thread:
My first advice would be never lie to your partner. If you tell the truth, then you and he can do something to make it better, but if you lie, he will think everything's fine and no progress will be made. I've been there - long first marriage where my needs weren't met because I didn't speak up. Now in my long 2nd marriage, my hubby and I have always discussed our sex life and it is SO much better this way! So come clean to him and work together to find that spot, and you will both be rewarded, trust me.
Good luck and have fun.