>>11406578
Theoretically, yes. It's even therapeutically recommended for chronic pain relief and encouraging healing of certain wound types. Just follow the safety guidelines; between the nipples is a terrible idea, despite how common it is in estim-related hentai.
>>11406864
I use a TENS, but the information should generalize, since my understanding is that the Coyote is more customizable instead of less. First, make sure that you've applied an appropriate conductive fluid to the area (electrogel or similar); not using a conductive fluid with estim is like trying anal without lube. Otherwise, start with the stim as low as possible and work up to your tolerance. Also, experiment with the different stim patterns available; even at the same energy levels, some feel nicer than others. You might also try changing the positioning of your electrodes; some electrodes just don't work well in certain areas. Different estim capable toys might give different results; definitely try anal if you can get your hands on a conductive lube.