I think you are confusing the term “female friend”.
A female friend isnt someone you go out with, have sex with sometimes, share stories with, go on a trip with. A female friend is someone you go out with, are attracted to, but she doesn’t want to have sex with you. That’s a female friend. What you are describing a FB, a FWB situation.
Heck, I could throw a party tomorrow, invite 10 girls I know, 5 of them being really hot, all I’m attracted to, all have boyfriends and /or won’t sleep with me. What is the point then? Now if I slept with them at time or another, I wouldn’t consider them a “friend”, and I would have no problem inviting them. But I wouldn’t invite them over knowing they are looking for an Alpha Dog.
The point being, if you are attracted a girl, and she doesn’t want to sleep with you, and you go out a friend, that is beta.