From my own experiences I have noted that most women find sex to be a chore, if you find a highly sexual woman you have won the lottery.
Also some women tend to reduce the sex in a manner to control the relationship, which can be a silly way of thinking from a mans point of view, as if women wanted to control us more, giving more sex would achieve better results.
Money is fun, sex gives you the feeling of being wanted , which is also great. Buying sex doesn't buy the being wanted feeling it still feels artificial.
The best would be to find the balance of both a great income and a woman that has a high sex drive, and I can say that the income is the easier of the two to achieve.
Also on a last word, a woman's look is NOT directly proportional to their sex drive.