The Internet affords anonymity (There is a great New Yorker slide that says, "On the Internet, no one knows you're a dog.") So you can be whoever you want to be on the Internet.
Internet partnering has become very acceptable, so that it has become the new relative norm of how to meet partners.
Okay, so then you get together and you think that you are going to have a particular kind of experience, you are already there, you are already aroused, you give up some of the discussion because it is much easier to just follow through and then afterwards you are like, "Man, you know? Internet access to places where you can meet sex partners is very affordable.
It is a lot cheaper to just go online and go to a chat room than to get up, go out of the house and go to a bar or a club or some other venue.
What differs from the local sex club, though, in one factor is they are not community-based.