The first 'sparks' of love can be a wonderful thing to behold, it is difficult to explain what that feeling of 'being in love' is. Excitement at meeting and seeing the man of your desires, and being consumed by thinking about them every second of every day. Not wanting to be apart because they are such an important part of your life in that moment. If you are lucky any sex is passionate, consuming and pleasurable in every place and everywhere. As time progresses sometimes the passion wears off somewhat and is replaced by a deeper more fulfilling love of absolute trust and enjoyment. You know your best friend, your lover is all rolled into one and has your back and best interests at heart. Sex is still good, enjoyable, all consuming but perhaps less frequent. Its a bit like trying to keep sprinting toward the finishing line of a marathon. It's just never going to happen as the distance is too great and something called exhaustion hits. Working, children, social commitments all suddenly take over and the competing time thieves insist on taking the very last ounce of energy from you.
I think I have to ask what is it at the moment that makes you stay with this man? Do you feel obligated in any way? Are you both still deeply in love or has the relationship changes to a more platonic relationship? Sex can be very mechanical, clumsy and sometimes painful if you are both inexperienced. I'm sure a lot of newcomers to the sex scene would wonder what all the fuss was about. Good sex is about pleasuring another human being. Taking time to find likes and dislikes, off the wall stuff, what is good, bad and just ok? Part of that is good communication. There is a lot to learn and explore about yourself and your partner to have good fulfilling sex. And it is not the sex that happens in books or films (sometimes it can be) but more often its pretty basic David Attenborough stuff of function.
Are you really still in love with this man? Do you love the very bones of his body and is that sense of love that you give returned? Or has something changed? Only really you can answer that question. It is ok to acknowledge that the light has gone from the first love and to find a partner that makes your heart sing all the time?
Am I encouraging you to split from your partner? No. But I think you could probably benefit from having some one to one communication about just how happy each of you are. Your sex life can be worked on with different techniques and trial and error to find likes and dislikes If you feel there is something physically not working for you you please go and chat with your GP.
But no one can change your emotional relationship if the lights have dimmed and one of you is 'out of love' after such a short time. You need to be honest with yourself and honest with each other. Do you still want to wake up next to this man every day from now for several decades? Take your time. You have a lifetime ahead of you to commit to and to find the man of your dreams.
You owe it to yourself to find a partner with whom your heart sings every time you see them. Then that flutter of your heart skipping a beat when you see them, as your lover, your best friend, your soulmate will last a lifetime and be free of huge heartache.