Lose payment? LW is free! If you have the pro version you only pay $18.80 so perhaps you should see THIS (click on link)

To block adult material you can use the filters; go to Tools>Options>Filters>Keywords & tick Ignore Adult Content & press the apply button. It's not a perfect filter but it works. Also see this: 1. Movie download issues 2. autogenerated spam results

If you are acting as an Ultrapeer then people will send files across your connection but that has little to do with you (as viewed in the bottom part of the monitor window.) It's people sending to other people.