Ahhhh I could have written this post, in almost every relationship I have been in. I went through the same thing you are going through now, wondering why all these men everywhere else seemed to be always wanting sex with their partner, yet mine were more interested in xbox/tv/sleep! Everything you wrote in your initial post, I experienced lots of times over. In fact, it was only a few years ago that I came to realise what the "problem" was. I am going to try and explain what I believe to be the issues going on here:
1) Our society hasn't moved on as fast as us females have in this sexual revolution. What do I mean by that? Well, us women can now own our sexuality, go for it, enjoy it without shame etc and we do and it is amazing, but the problem is that society is still telling us, pushhing unconscious thoughts into our heads from a young age, as males and females, that "Men are after one thing" or "Men always want sex" and that women should be more choosy and careful not to be labelled "slut" Okay, now here is the problem.....Men are NOT always after one thing, nor do they always want sex and yes, they do indeed turn sex down. Do you know I see the issue you posted in myself and in more and more women lately and I believe it is because we almost have it unconsciously drummed into us through TV/friends/parents/magazines the lot, that men always want sex and its heartbreaking to see so many young women wonder what is wrong with them. I went through ten years of this exact hurt and all because I thought men were supposed to always be up for it, so why wasnt mine? Yes, blokes in the pub, or blokes online will even say things to continue this myth because its not manly (or whatever the correct term is) to be telling mates they "dont feel like sex tonight" Does this make sense? Its like this myth is going around, breaking womens confidence down and putting so much pressure on men to perform as us ladies enjoy our new sexual freedom. But we are hurting each other.
2) Taking things for granted. As you already pointed out, after the honeymoon period, things on the sex front tend to die down. It is another myth that if you love someone, it should be easy and no work at all. This is twaddle. We must always continue to make little efforts to show appreciation for our partners, but as you settle into a relationship and all the stresses and time consuming events of life happen, we tend to put our partners on the back burner, often being too tired, or just wanting to sleep or relax when we finally walk through the door after a hard day. I think your partner may be doing this. Yeah he loves you and fancies you, but a little work is needed to keep a relationship bubbling with passion. I would suggest telling him you feel you have both been taking each other for granted and wouldnt it be nice to put aside "us" time, once or twice a week/month, where there are no distractions like phones or xbox. Have a date night/movie night etc and chat and have fun
3) When its available all the time...it aint as fun. Now this is going to sound harsh, but remember, this is coming from a woman who experienced this issue with multiple partners and for ten years before realising this golden nugget of truth: I have a super high sex drive, like you, and I also more often than not, made the first moves. The thing is....when you have an endless supply of cake, every night...you know you can have cake, it kinda gets a bit...taken for granted that cake will always be available at any time. Why do I know this? My guy told me. During one of our heart to hearts when I was experiencing this same issue as you, I asked his opinions and he basically outright told me that I am always the aggressor, there is nothing for him to work for. Men like a little challenge, a little conquering, the thrill of the chase, the trying to get what they want. I think this is kinda genetically a man thing, to be the go-getter, to "win" or "earn" something and here I was, jumping on him every night, not giving him the chance to miss it, not giving him the chance to WANT it, not giving him the chance to work for it. Now this is a difficult one when you have a high sex drive, but I honestly recommend sorting yourself out in the bathroom every night and allow him to "conquer" you. Don't give in right away, make the chase fun, this gives him the chance to chase.
Aside from the above advise hunni, I also echo what everyone else has said about talking to him and telling him how you feel. Tell him how you feel too, ya know? I know how hurtful and disheartening this can feel, but if you let it simmer, you will end up feeling resentful and angrier. I did with my exes. I am just glad I managed to communicate better with my current guy and I learned a lot. Also remember, mismatched sex drives are extremely common issue in relationships. compromise is key. x
Good luck