Sex is not everything in a couple, but it is an important part of the relationship. If a couple does not understand each other in bed, even if they love each other very much, it will produce dissatisfaction and frustration that sooner or later, but invariably, will end up affecting the relationship as a whole, with the possibility of ending it forever.
Among the main causes of incompatibility are: different sexual tastes or timings (different libidos), discordance in the size of the genitals (too large or too small) that can cause painful or unsatisfactory intercourse, premature ejaculation, among others. Likewise, a couple that bases their relationship solely on sex, lacking everything else, such as love, cohabitation, intimacy, understanding, support, solidarity, and fidelity, is unlikely to survive. Therefore, there must be a balance.
Now, if you consider that you and your partner are incompatible in some sexual aspect, I recommend that you communicate openly with him/her, without prejudices or recriminations, and discuss the topic. In that conversation, the following questions can be raised: Do we want to have sex with the same frequency? Do we like the same things in bed? Am I open to trying things that my partner likes, even if they don't interest me? It's not easy; there will be things that you will have to negotiate, just make sure that both parties are satisfied with what has been agreed upon.
If you need more help, do not hesitate to consult with a therapist or sexologist, who can, as an impartial and objective part, provide you with the necessary tools to improve your sexual relationships and, with it, your relationship in general. I always emphasize that when we cannot resolve something on our own, the best thing we can do is ask for help from someone who is an expert and knowledgeable about the topic.Don't be ashamed, anything you do to save a relationship you want to maintain will be worth it.