Marriage or LTRs as "paying for sex"? On some level I gues they are....to coexist we count on one another. Either financially, emotionally, or physically. That's part of partnership.
Have I ever paid for sex, or been paid for sex, per se? No. And I am not sure that I ever would. 50% of the journey is attraction, as far as I am concerned....and honestly I don't find that many men attractive. Not all-around sexy...mind-n-body sexy. I'm sure I might find it in a jiggolo, but I bet it would take me a lot of searching.
Of course, 25% of the journey is the chase. You know, the seduction.

Getting him to want you, and maybe even making him work for it....just a little bit.
So.....75% of my fun with sex depends on factors a jiggolo wouldn't be able to pull off....so I guess the answer is no.
But I have no problems with those who do....