I don't think that is true. You certainly have immature women, and women who like to talk about things that will never act on them. You also have men that go the range from having no respect for the woman and no respect for themselves to those who are very much interested in helping her live out what has been a fantasy.
Simply put, as wide a range of interests as you have on this site is also as wide a range of people. Some come here and seem to have an issue with all sorts of terms and want to scare people off because of all of the things that can go wrong. Others seem to want to suggest the other extreme, that white women all exist to serve the sexual needs and desires of the black men that wish to have them.
In the middle are those who think things through, and make a choice. Be the woman single or not, she is considering if she is willing to have sex with someone, and if she would like that man to be a black man. She realizes all the sayings, and is looking more at the sex act and her desire to experience it. If she has a partner that is male, he may wish to have her feel unlimited in her sexual enjoyment much like she wants him to feel the same way. Perhaps she has a "fetish" that she wants to try out and it involves sex that is not based on a loving relationship but instead about trying out a bit of a "slutty" side.
So, a smart man on here would try and see if he matches the woman. It's possible that they share the same interests, and its possible they do not. While I get that people wish to remain protected online, being able to carry on a conversation is important as well as being able to show each other what you look like. Be it a photo, a skype chat, whatever. Most women, even those who are extremely open with their sexuality, still want to have a bit of an attraction to the guy. Obviously most guys want to be able to look at the woman and find her attractive also. Some sort of chemistry of the mind, even if only for a few hours......