It's normal for a relationship to start of steamy and die down as time goes on; I have been in a committed relationship for the past five years so I can testify to that. I don't know exactly why this happens but it does, and if you love each other and plan on staying together you will have no choice but to find ways to keep the fire burning before it completely dies.

When will it happen in your relationship? I don't know, but I can promise you that somewhere in your quest to find new ways to stimulate your relationship, you will come across PORN. (He will probably be the one to suggest it)