I can buy sex whenever I want, love has a much higher value. Buying a prostitute is not erotically interesting enough for me to be worth it, only if I could be her friend, and they can't of course be your friend. A sex-friend is on the contrary interesting, exciting and fun, so the woman must be a friend or the sex will not be exciting. The optimum is marriage with a soulmate partner, which means there will never be tensions, based on the harmony between your natural behaviours you were born with. This way you can be closer to each other without annoying each other, and closer means = more intense, more erotical, more potential, more excitement, as long as you don't stagnate. If you have natural tensions between each other you can not be as close while also staying happy in this place where you want to be erotically. I think a perfect solution for modern times, where you maybe not find your soulmate, is an affair, that maybe lasts a lifetime. It means you know you have tensions, and you will not marry, and because of that the relationship is much more about fun, and more about sex, because you don't force each other to be too close. It can be much better than trying to find the maximum of possible intensity. This happens also if two bi-sexual women who both want to marry men are dating, or if a young man and an older woman are dating. But it can work for any relationship, the hardest part is to communicate that you don't want to marry before the relationship, then you can highly profit from it, especially if you are roommates.

I would think of people being prudes who think bad of it. There should be much more older women dating young men, it would make society more healthy. Think about it:
-The young men can have sex
-Old single women can have sex
-It will be easier for the men to find real dates later, because old women know a lot of people and can also teach them dating-stuff.

It's a win-win for everyone. What I think many do wrong is that they think such a relationship is about sex only. It should involve a friendship always, otherwise you could just buy a prostitute instead. You must share a hobby or interest like fitness/sports, massaging each other, festivals, gaming, creative design maybe, health-routines, music. It is of course a bit harder to find something you can do together than it is normally. If you don't value the other person as a real friend, like you would with other friends, then the sexual affair is most of the time also not really worth it so much. And you should be aware that the young man might want to marry someone else later and get kids, so it will nearly always be a longtime affair, that maybe can be paused and unpaused, but marriage is very unlikely.