Relationships aren't easy and after a while the newness goes and along with it the sex. You need communication between you both...you need to learn each others bodies...this is something you can't do with a one night stand...that's just a thrill. But a relationship takes time and work...don't think everyone has magical sex every time because nobody does after awhile.
Bringing things as mentioned before like rile playing dressing up...going out on a nice date with a meal etc to rekindle the feeling of wanting... It can be done...I've done it. And I started having empty hollow sex when I was young so I do understand

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