To be fair, it isn't always profit from. I've been with some higher body count partners, between the good sides, they also often have negatives, people who have broken their boundaries, triggers formed because someone did something they might not have wanted and so on. And then it happens that they may not want to do something with you because it reminds them of some asshole from the past and so on. In a casual relationship, this is fine, but its tough being in a serious relationship with such elements.