It varies. Based upon the relationship, how much I'm working, and a lot else.
I got into a relationship early in my career, with a former client. It was never a serious relationship, and we were not in love with each other. I was pretty high-volume at the time, and had some really arduous days and bad experiences. When I saw him afterward (or on days I didn't work), honestly, it just felt like more of the same. It felt like I was working for free. But, the relationship was not about love. He was using me for free sex, and I needed his companionship, at the time.
A few years later, when I was lower-volume and had more of an intimate relationship, I desired sex with my BF, and enjoyed it much more. Partly, because my v***a was not torn up, and I hadn't endured butt-poking, nipple-twisting assholes for hours each day (or, sometimes, hours at night into the early morning). But mostly, because he provided things other than sex. He provided touch, tenderness, understanding. Friendship, love. (Plus, he never hurt me. I could always tell him what was good and not good)
There were a few times it felt like an obligation with guy #2, but that was when I was starting to become unhappy with the relationship, and fell out of love with him. Even without love (or being in love), though, I still just enjoyed sex with someone I cared about, and with whom I felt cared about... and with whom I could truly be intimate.