Tips to get your man in the mood for oral sex

My favorite thing in the world is to have someone go down on me. My boyfriend and I haven't been together long and he's admitted to me he's only preformed oral sex on a girl once so he is a little shy about it. Most times I have to ask, although he has done it on his own a few times. I asked him how he feels.. he says he doesn't mind doing It, that the taste is fine but he just feels as if he has to be in a certain mood to want to preform oral and that is why he doesn't do it often. Any tips on how to possibly get him in that mood more?