I agree with the others that you do sound judgemental of your friend, but I get that you need to talk about it & it's difficult to express your concerns without sounding judgemental
I had a friend like this, she called it "charity shags" & some of them were gobsmacking 🥴 & she didn't enjoy it either & complained & laughed at them like hell afterwards, but over time I realised that she enjoyed the attention & adulation she felt it brought her. Like you I couldn't see it at all & worried about how little respect she seemed to have for herself. There was definitely a large element of that in her case. I didn't judge her though & just accepted that we were very different, but did worry about her at times. Like her shagging the very overweight brother of the guy she did have a thing for to get back at him for not treating her well 🥴
Will your friend treat you in the same emotionless way, I can't say, but with hindsight, my ex friend certainly did. At a time when I was I'll, had walked out of my 16 year career job due to sex discrimination & constructive dismissal, stabbed in the back badly by another old friend I'd done a lot for & more, that meant I was going through a very hard time mentally.
ExGF rang me in tears begging me to help her out at her self employed work. She'd taken on orders she wasn't skilled enough to do & non of her staff were. My area of expertise. I really didn't want to, didn't need the money as I'd just won a court case against my ex employer, it meant taking tiny DD to london & to let someone else I barely knew care for her, but friend was sobbing her heart out & I reluctantly agreed. I pretty much had to organise all of it & muck in to put it all together too.
2 things happen within the space of an hour that meant I saw her in a completely different light. A visit from her customer who came to talk to me about what I was building, made me realise that "Friend" had used my C.V. To get the job. I apparently worked under her at the company I had ran & she'd told customer that she was bringing me on board to do the order... so her tears & begging me were pure manipulation to get me there as planned. About half an hour later, "GF" took a phone call from what turned out to be a mutual friend. "GF" told phone friend I was their sorting things out on her order, followed by a cackle & "everyone works for me in the end"
In my head I was purely there to do her a big favour, I hadn't even discussed money as I'd have scared her to death with my usual rate. I'd have done it for free so long as wasn't out of pocket, which made that all the worse.
Next time she rang me for a favour which soon became her MO, I told her to fuck off