https://illust.daysneo.com/illustrator/888btiopro/
Most effective: Large, flat areas choose the arms and legs. Least effective: Curved areas like the underarms, and also cause significant trauma for the face some other thin skinned areas. One more thing--please don't ignore citizens. A quick "thanks, but no thanks" note may be so much much better than no reply at 888b every. In fact, next time you're replying to a voice-mail on the site, research the new "Thanks but No Thanks" layout. It's a quick way to nicely let someone know about to catch interested in corresponding. Don't be worri