That last one is the most important, I think. It's what you can afford if you're a time traveller with lots of great sf gadgets. But at the core of it all is the philosophy. The philosophy is simple. Sex can be an art form.
Great sex can be great art.
And if you want an artist to produce great art, one approach is to give them comfortable surroundings. You keep them from worrying about money, about their safety. You let them learn and teach and share. You appreciate what they do. You respect their work.