You don't have to 'share' Alex, which is exactly why you had an option to tell her NO when she asked you to join. If that was not clear enough to you of what's going on, I have no idea what else I could do to be more clear. You also can't say that you do not care to learn any definitions but then demand I "tag" it. What am I to tag if you don't want to know what the tags mean? Those are clearly two conflicting ideas that you hold.MOST men do not want to share ANY women nor want to have sex with another man present, We also do not care for learning the various definitions of fetishes we care nothing about like futa-anything, trans-anything or neo-anything. But regaradless you need to define whatever it is and tag it if you do not want us to do it for you and warn people to stay away.
Finally, you need to do some self reflecting. I can't imagine any scenario where you think it's alright to call a developer a pedophile for not warning you that the world isn't filled with woman who pledge their vagina's exclusively to you as soon as you meet them. That doesn't even make sense.