Different sex drives - advice needed

What should I do if I want to have sex 6-8 times a month, but my husband only wants to have sex with me around twice a month? Even after 5 years of marriage, every time I bring it up he gets visibly emotionally hurt and we can never finish the conversation. I would love some relationship advice here. He likes sex to be "naturally" induced and doesn't even like planning sexy time. If it is planned, it puts a lot of stress and pressure on it for him and he can't get in the mood. I've debated about buying sex toys and just satisying my zellous sex drive myself, but everytime I masterbate, I feel guilty and become more emotionally distant towards him. Thoughts? What should I do?