I had a SB for a couple of years. It was a regular ff type of relationship, in the sense that we didn't have sex each and every time. Often enough, but sometimes we were just happy to hang out, play pool, catch-up with each other. It was a very pleasant and relaxed relationship. When the relationship ended, she remained a good friend. We still hang out from time to time.
I didn't pay her a fix allowance. I bought her expensive clothes she wanted, bought her a laptop, jewelry, paid for her driving lessons (lol!). Yes some money was involved but she preferred expensive gifts and I was fine with it (isn't it what daddies do?) It came up to about $1500/month.
We saw each other at least once a week for sex, but more often socially. She'd call me for lunch if she was around where i worked, sometimes a quickie in an hotel, sometimes she'd stay the night, some other times we just went out and kissed each other good night. There was never any pressure, which made the sex all the more enjoyable. When we had sex, she was also in the mood (and demonstrated it quite loudly! Lol!)
You might wonder if after all she was not just a friend with benefits. But given she was very hot, 20yo and really stunning, model type, and that I was in my 50s, I doubt she would have spent all that time with me. She was being hit on all the time, so she was not desperate for partners. But I guess she did also appreciate my friendship, mentorship and company after all. Or at least, she was very good at giving me that illusion...
Does it answer your questions LC18?