The first may be labelled insatiable. The second, boring.
Yet those preferences may reflect very different relationships with novelty. For one person, uncertainty itself is exciting. For another, predictability makes it easier to relax and stop wondering whether they are doing something “correctly.”
Asking “Who should give in?” does not help much, because sexual compromise does not work like splitting the last piece of cake. If one person wants a particular practice and the other absolutely does not, averaging their preferences still does not create desire.
But there is often a lot of space between yes and no. Someone can want novelty without wanting this particular experiment. A fantasy can be interesting without needing to be enacted. A couple can look for a new scenario that is genuinely appealing to both.
Sexual differences become most interesting not when a winner has to be chosen, but when both people can understand what each of them is actually looking for in “I want something new” or “I prefer what I know.”