Chemistry often can't be expalined logically. It appears more on a subconscious level.
How old are you? For some people, it takes a while to understand who/what type of men/women might attract them the most. I knew my type since I was 12.
Many people enjoy sex the most only if they are really in love with their partner/spouse. Some can only enjoy it in long-term happy relations feeling more secure. Some need a constant thrill of changing partners putting themselves at risk of STIs because no condom is ever 100% safe and can suddenly come off.
Being a good lover is a skill most people can master but not everyone gives it enough needed attention to find out what works the most and the best for each person as everyone is very unique and individual.
I think you haven't met a great lover yet who would give you the best sex of your life. That's why you feel this way. Also, not many people are naturally talented lovers.
Once you fall in love properly and mutually you will experience it.
In great lovemaking, everything matters: great smell, good hygiene, ability to discuss openly and honestly all likes and dislikes, all preferences, good quality long enough foreplay, variety, and possible occasional spontaneous unpredictable pleasant for both actions. To be sexually compatible people have to like and be turned on by the same things.
Sometimes a bit of mystery, sometimes a special look that means mutual sexual desire, etc.
Good luck with finding the right man for you.