This issue is not biological - it has to do with the relationship. Of this I feel pretty sure. Please read the small and invaluable book, "Light His Fire". It has the answers. You love each other - it is possible to reclaim your intimacy! (emotional and physical)
Oh, and p.s. I'm also a woman of passion and have been in the reverse situation where I was sexually neglected. Also, please don't be offended by the p 0 r n. I don't get it, but it is a guy thing. Every guy. Before p 0 r n videos, p 0 r n was LIVE so be grateful for videos!!!!!!!!!! p 0 r n is not related in any way to your relationship or sex life, IMO.