I have a lot of room to move around in my space, so I try to mix it up between sitting and standing. Depending on the mood of the traffic coming in.
I don't do anything overly sexual in free chat, but I try to keep as much of my body in frame as I can. I have all my toys displayed behind me and like to show off and tease.
But if someone wants to see something specific or the classic "can you stand", I ask for a tip, because if I didn't I'd just be there doing free stuff forever.
Sometimes people are just wondering if you're really live or a recording, or if you have a tip menu. Usually just verbally saying it or typing it in the chat will get them to tip or be enough to prove you're real.
If they don't tip and keep demanding, chances are they're the type of member that bounces from room to room to see who will fulfill their demands for free, and I don't like catering to those members.
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@AudriTwo said, morning are really great when you're starting out! Your placement will be much better than at night. The traffic is much different, too; people don't really want to waste time and tend to go straight to shows. Great way to hone your flow and build up a following.