Oral Sex issue

Been with my DH for over 5 years...been married a little less than one...and despite how many times I've told him (in the past cause I gave up saying anything years ago)...he's NEVER gone down on me. Never even made a move to.
Anyone else with this issue? Idk how to bring it up anymore. 
I go down on him? Isn't it only fair I get some special treatment too?