husband has 'motorcycle fetish ?!? help!

Hi,
anyone out there can help clarify to me or recommend reading as to what I am dealing with here? My husband and I have never had a steamy sex life and he has told me that he has a 'motorcycle fetish' At first I found that exciting, but it has been a couple of years since the revelation and still what occurs in the boudoir can be best described as 'coitus'. We have not been able to discuss our sex life in any productive way together and he doesnt want to go for therapy. It has been a year since we have had intercourse and I am really feeling desperate. I can't help thinking of the easy symbolism between the attraction to 'cock-rockets' and penises. Could he be gay? Does anyone know anything specific to motorcycle fetishes?